Recyclable multilayer films that have a sealing layer formed from a blend of polypropylenes.

Description

1 / 42 Recyclable multilayer films that have a sealing layer formed from a blend of polypropylenes. Field of Invention

[0001] The present invention relates to a multilayer film (F) comprising a coating layer, a core layer and a sealing layer, wherein the sealing layer comprises a polypropylene composition comprising a RAHECO and two random propylene-ethylene copolymers. Background of the Invention

[0002] Plastic packaging is widely used in everyday life due to a favorable cost / performance ratio. Polyolefins are easy and economical to produce with good properties and are widely used in plastic packaging.

[0003] Conflicting properties are frequently required in the packaging industry. For example, high stiffness and strength, as well as excellent sealing behavior and good optical properties are required in parallel for plastic films. Different types of polyolefin, for example, polypropylene and polyethylene, are routinely combined in blends and / or used in different layers of multilayer films to achieve the desired properties. However, the use of more than one type of polymer complicates the task of recycling the resulting plastic packaging.

[0004] One approach to enabling recycling is a single-material solution, where only one type of polymeric material is used. This simplifies the recycling of post-consumer waste and manufacturing waste, but limits the range of available properties. As such, there is still a need for plastic packaging that can be formed from a single type of polymer, even though it comprises several different types of polymers within that polymer type, optimizing the mechanical, optical, and sealing properties required for packaging materials, while also... Petition 870250078585, dated 03 / 09 / 2025, page 12 / 167 2 / 42 which are easy to recycle. Summary of the Invention

[0005] Therefore, the present invention is directed to a multilayer film (F) comprising, in the determined order, the following layers: (A) a coating layer comprising at least 90% by weight, based on the total weight of the coating layer, of a polypropylene or a mixture of polypropylenes; (B) a core layer comprising at least 90% by weight, based on the total weight of the core layer, of polypropylene or a mixture of polypropylenes; (C) a sealing layer comprising at least 90% by weight, based on the total weight of the sealing layer, of a polypropylene (PC) composition comprising the following components: i) 20 to 70% by weight, based on the total weight of the polypropylene (PC) composition, of a heterophasic random copolymer of propylene-ethylene (RAHECO), which has a melt flow rate (MFR2), determined according to ISO 1133 at 230 °C and 2.16 kg, in the range of 0.1 to 10.0 g / 10 min, comprising: a) a crystalline matrix (M) that is a random copolymer of propylene-ethylene; and b) an amorphous propylene-ethylene elastomer (E); ii) 10 to 50% by weight, based on the total weight of the polypropylene (PC) composition, of a first random copolymer of propyleneethylene (R-PP1) having a melt flow rate (MFR2), determined according to ISO 1133 at 230 °C and 2.16 kg, in the range of 1.0 to 6.0 g / 10 min; and iii) 10 to 50% by weight, based on the total weight of the polypropylene (PC) composition, of a second random copolymer of propyleneethylene (R-PP2) having a melt flow rate (MFR2), determined according to ISO 1133 at 230 °C and 2.16 kg, in the Petition 870250078585, dated 03 / 09 / 2025, page 13 / 167 3 / 42 range of 7.0 to 20 g / 10 min wherein the combined amounts of heterophasic random copolymer of propylene-ethylene (RAHECO), of the first random copolymer of propylene-ethylene (R-PP1) and of the second random copolymer of propylene-ethylene (RPP2) are at least 90% by weight, preferably at least 95% by weight, with the greatest preference of at least 97% by weight, relative to the total weight of the polypropylene (PC) composition. Definitions

[0006] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as that commonly understood by an individual of ordinary skill in the art to which the invention pertains. However, any methods and materials similar or equivalent to those described herein may be used in practice to test the present invention, the preferred materials and methods being described herein. In the description and claims of the present invention, the following terminology shall be used in accordance with the definitions set forth below.

[0007] Unless clearly indicated otherwise, the use of the terms “a”, “an” and similar terms refers to one or more.

[0008] The following quantities are given as a % by weight (% by w), unless otherwise stated.

[0009] A propylene homopolymer is a polymer consisting essentially of propylene monomer units. Due to impurities, especially during commercial polymerization processes, a propylene homopolymer may comprise up to 0.1 mol% of comonomer units, preferably up to 0.05 mol% of comonomer units, and most preferably up to 0.01 mol% of comonomer units.

[0010] A propylene copolymer is a copolymer of propylene monomer units and comonomer units, preferably Petition 870250078585, dated 03 / 09 / 2025, page 14 / 167 4 / 42 selected from ethylene and C4-C8 alpha-olefins. A propylene random copolymer is a propylene copolymer in which the comonomer units are randomly distributed along the polymer chain, while a propylene block copolymer comprises blocks of propylene monomer units and blocks of comonomer units. Propylene random copolymers may comprise comonomer units of one or more different comonomers in their carbon atom quantities.

[0011] Typically, heterophasic propylene copolymers comprise: a) a crystalline matrix of propylene homopolymer or copolymer (M); and b) an elastomeric rubber, preferably a propylene-ethylene elastomer (E);

[0012] In the case of a heterophasic propylene random copolymer, said crystalline matrix phase is a propylene random copolymer and at least one alpha-olefin comonomer.

[0013] The elastomeric phase can be a propylene copolymer with a high comonomer content that is not randomly distributed in the polymer chain, but is distributed in a comonomer-rich block structure and a propylene-rich block structure. A heterophasic polypropylene copolymer is usually distinguished from a monophasic propylene copolymer by exhibiting two distinct glass transition temperatures Tg that are attributed to the matrix phase and the elastomeric phase.

[0014] The present invention will now be described in more detail. Detailed Description

[0015] Therefore, the present invention is directed to a multilayer film (F) comprising, in the determined order, the following layers: (A) a coating layer; (B) a core layer; and (C) a sealing layer. Sealing layer [00 16] The sealing layer of the present invention comprises at least Petition 870250078585, dated 03 / 09 / 2025, page 15 / 167 5 / 42 90% by weight of a polypropylene (PC) composition, more preferably at least 95% by weight of a polypropylene (PC) composition, much more preferably at least 97% by weight of a polypropylene (PC) composition, and most preferably the polypropylene (PC) composition consists of a polypropylene (PC) composition.

[0017] The polypropylene (PC) composition comprises the following components: i) 20 to 70% by weight, based on the total weight of the polypropylene (PC) composition, of a random heterophasic propylene-ethylene copolymer (RAHECO); ii) 10 to 50% by weight, based on the total weight of the polypropylene (PC) composition, of a first random copolymer of propyleneethylene (R-PP1); and iii) 10 to 50% by weight, based on the total weight of the polypropylene (PC) composition, of a second random copolymer of propyleneethylene (R-PP2).

[0018] The combined amounts of heterophasic random copolymer of propylene-ethylene (RAHECO), of the first random copolymer of propylene-ethylene (R-PP1) and of the second random copolymer of propylene-ethylene (R-PP2) are at least 90% by weight, preferably at least 95% by weight, more preferably at least 97% by weight, relative to the total weight of the polypropylene (PC) composition.

[0019] More preferably, the polypropylene (PC) composition comprises the following components: i) 25 to 60% by weight, based on the total weight of the polypropylene (PC) composition, of a random heterophasic propylene-ethylene copolymer (RAHECO); ii) 12 to 48% by weight, based on the total weight of the polypropylene (PC) composition, of a first random copolymer of propyleneethylene (R-PP1); and Petition 870250078585, dated 03 / 09 / 2025, page 16 / 167 6 / 42 iii) 12 to 48% by weight, based on the total weight of the polypropylene (PC) composition, of a second random copolymer of propyleneethylene (R-PP2).

[0020] Preferably, the polypropylene (PC) composition comprises the following components: i) 30 to 50% by weight, based on the total weight of the polypropylene (PC) composition, of a heterophasic random copolymer of propylene-ethylene (RAHECO); ii) 15 to 45% by weight, based on the total weight of the polypropylene (PC) composition, of a first random copolymer of propyleneethylene (R-PP1); and iii) 15 to 45% by weight, based on the total weight of the polypropylene (PC) composition, of a second random copolymer of propyleneethylene (R-PP2). [00 21] In a particularly preferred embodiment, the polypropylene (PC) composition comprises the following components: i) 30 to 50% by weight, based on the total weight of the polypropylene (PC) composition, of a heterophasic random copolymer of propylene-ethylene (RAHECO); ii) 10 to 20% by weight, based on the total weight of the polypropylene (PC) composition, of a first random copolymer of propyleneethylene (R-PP1); and iii) 40 to 50% by weight, based on the total weight of the polypropylene (PC) composition, of a second random copolymer of propyleneethylene (R-PP2).

[0022] In an alternative embodiment, the polypropylene (PC) composition comprises the following components: i) 30 to 50% by weight, based on the total weight of the polypropylene (PC) composition, of a heterophasic random copolymer of propylene-ethylene (RAHECO); Petition 870250078585, dated 03 / 09 / 2025, page 17 / 167 7 / 42 ii) 25 to 35% by weight, based on the total weight of the polypropylene (PC) composition, of a first random copolymer of propyleneethylene (R-PP1); and iii) 25 to 35% by weight, based on the total weight of the polypropylene (PC) composition, of a second random copolymer of propyleneethylene (R-PP2).

[0023] In another alternative embodiment, the polypropylene (PC) composition comprises the following components: i) 30 to 50% by weight, based on the total weight of the polypropylene (PC) composition, of a heterophasic random copolymer of propylene-ethylene (RAHECO); ii) 40 to 50% by weight, based on the total weight of the polypropylene (PC) composition, of a first random copolymer of propyleneethylene (R-PP1); and iii) 10 to 20% by weight, based on the total weight of the polypropylene (PC) composition, of a second random copolymer of propyleneethylene (R-PP2).

[0024] If components other than the heterophasic random copolymer of propylene-ethylene (RAHECO), the first random copolymer of propylene-ethylene (R-PP1) and the second random copolymer of propylene-ethylene (R-PP2) are present, it is preferable that these be additives.

[0025] A person skilled in the art will be able to select suitable additives that are well known in the art.

[0026] The additives are preferably selected from pigments, antioxidants, UV stabilizers, anti-scratch agents, mold release agents, acid scavengers, lubricants, antistatic agents and mixtures thereof.

[0027] It is understood that the additive content includes any carrier polymers used to introduce the additives into the polypropylene (PC) composition, i.e., standard blend carrier polymers. An example of such Petition 870250078585, dated 03 / 09 / 2025, page 18 / 167 8 / 42 carrier polymer would be a polypropylene homopolymer in powder form.

[0028] The individual components will now be described in more detail. Heterophasic random copolymer of propylene-ethylene (RAHECO)

[0029] The heterophasic random copolymer of propylene-ethylene (RAHECO) is supplied in an amount in the range of 20.0 to 70.0% by weight, preferably in the range of 25.0 to 60.0% by weight, most preferably in the range of 30.0 to 50.0% by weight, relative to the total weight of the polypropylene (PC) composition.

[0030] The heterophasic random copolymer of propylene-ethylene (RAHECO) comprises: a) a crystalline matrix (M) that is a random copolymer of propylene-ethylene; and b) an amorphous propylene-ethylene elastomer (E).

[0031] The heterophasic random copolymer of propylene-ethylene (RAHECO) has a melt flow rate (MFR2), determined according to ISO 1133 at 230 °C and 2.16 kg, in the range of 0.1 to 10.0 g / 10 min, more preferably in the range of 0.3 to 5.0 g / 10 min, with the highest preference in the range of 0.5 to 2.0 g / 10 min.

[0032] The heterophasic random copolymer of propylene-ethylene (RAHECO) preferably has a melting temperature (Tm), determined by differential scanning calorimetry (DSC), in the range of 130 to 155 °C, more preferably in the range of 134 to 150 °C, with the highest preference in the range of 138 to 145 °C.

[0033] The crystal matrix (M) of the heterophasic random copolymer of propylene-ethylene (RAHECO) is preferentially free of 2,1 regiodefects, as determined by 13C-NMR spectroscopy.

[0034] The absence of 2,1 regiodefects is an indication that the heterophasic random copolymer of propylene-ethylene (RAHECO) was polymerized in the presence of a Ziegler-Natta catalyst.

[0035] Therefore, preferably, the heterophasic random copolymer of Petition 870250078585, dated 03 / 09 / 2025, page 19 / 167 9 / 42 propylene-ethylene (RAHECO) was polymerized in the presence of a Ziegler-Natta catalyst.

[0036] The polymeric portion of the heterophasic random copolymer of propylene ethylene (RAHECO) can be characterized according to the CRYSTEX QC method using trichlorobenzene (TCB) as solvent. This method is described below in the determination methods section. The crystalline fraction (CF) contains mostly the matrix phase and only a small portion of the elastomeric phase, and the soluble fraction (SF) contains mostly the elastomeric phase and only a small portion of the matrix phase. In some cases, this method results in more useful data, since the crystalline fraction (CF) and the soluble fraction (SF) correspond more accurately to the matrix and elastomeric phases, respectively.Due to differences in the separation methods of xylene extraction and the CRYSTEX QC method, the properties of the XCS / XCI fractions, on the one hand, and the crystalline / soluble (CF / SF) fractions, on the other, are not exactly the same, meaning that the amounts of the matrix phase and the elastomeric phase may differ, as well as their properties.

[0037] The random heterophasic copolymer of propylene-ethylene (RAHECO) preferably has an ethylene content (C2(total)), determined by CRYSTEX QC analysis, in the range of 3.0 to 15.0% by weight, more preferably in the range of 5.0 to 13.0% by weight, and most preferably in the range of 7.0 to 11.0% by weight.

[0038] The random heterophasic copolymer of propylene-ethylene (RAHECO) preferably has a soluble fraction (SF) content, determined by CRYSTEX QC analysis, in the range of 10 to 45% by weight, more preferably in the range of 13 to 35% by weight, with the highest preference in the range of 16 to 25% by weight.

[0039] The random heterophasic copolymer of propylene-ethylene (RAHECO) preferably has an ethylene content of the soluble fraction (C2(SF)), determined by CRYSTEX QC analysis, in the range of 17.0 to 60.0% by weight, more preferably in the range of 20.0 to 50.0% by weight, with the highest preference in the range of 25.0 to 40.0% by weight. Petition 870250078585, dated 03 / 09 / 2025, page 20 / 167 10 / 42

[0040] The propylene-ethylene random heterophasic copolymer (RAHECO) preferably has an intrinsic viscosity of the soluble fraction (iV(SF)), determined by CRYSTEX QC analysis, in the range of 1.20 to 4.50 dL / g, more preferably in the range of 2.00 to 4.00 dL / g, with maximum preference in the range of 2.40 to 3.40 dL / g.

[0041] The heterophasic random copolymer of propylene-ethylene (RAHECO) preferably has a crystalline fraction (CF) content, determined by CRYSTEX QC analysis, in the range of 55 to 90% by weight, more preferably in the range of 65 to 87% by weight, with the highest preference in the range of 75 to 84% by weight.

[0042] The random heterophasic copolymer of propylene-ethylene (RAHECO) preferably has an ethylene content of the crystalline fraction (C2(CF)), determined by CRYSTEX QC analysis, in the range of 1.0 to 8.0% by weight, more preferably in the range of 2.0 to 7.0% by weight, with the highest preference in the range of 3.0 to 6.0% by weight.

[0043] The heterophasic random copolymer of propylene-ethylene (RAHECO) preferably has an intrinsic viscosity of the crystalline fraction (iV(CF)), determined by CRYSTEX QC analysis, in the range of 1.20 to 4.50 dL / g, more preferably in the range of 2.00 to 4.00 dL / g, with maximum preference in the range of 2.60 to 3.60 dL / g.

[0044] It is also preferable that the intrinsic viscosity ratio of the soluble and crystalline fractions, (iV(SF) / iV(CF)), determined by CRYSTEX QC analysis, be in the range of 0.50 to 2.00, more preferably in the range of 0.75 to 1.50, with the highest preference in the range of 0.90 to 1.10. First random copolymer of propylene-ethylene (R-PP1)

[0045] The first random copolymer of propylene-ethylene (R-PP1) is present in the polypropylene (PC) composition in an amount ranging from 10.0 to 50.0% by weight, preferably from 12.0 to 48.0% by weight, most preferably from 15.0 to 45.0% by weight, relative to the total weight of the polypropylene (PC) composition. Petition 870250078585, dated 03 / 09 / 2025, page 21 / 167 11 / 42

[0046] As should be understood by those skilled in the art, in contrast to the heterophasic random copolymer of propylene-ethylene (RAHECO), the first random copolymer of propylene-ethylene (R-PP1) is monophasic.

[0047] The first propylene-ethylene random copolymer (R-PP1) is a random copolymer with propylene monomer units and ethylene comonomer units.

[0048] The first random copolymer of propylene-ethylene (R-PP1) has a melt flow rate (MFR2), determined according to ISO 1133 at 230 °C and 2.16 kg, in the range of 1.0 to 6.0 g / 10 min, more preferably in the range of 1.2 to 4.5 g / 10 min, with the highest preference in the range of 1.6 to 3.0 g / 10 min.

[0049] The first random copolymer of propylene-ethylene (R-PP1) preferably has an ethylene content (C2), determined by quantitative 13C-NMR spectroscopy, in the range of 1.0 to 5.5% by weight, more preferably in the range of 1.0 to 3.5% by weight, with the highest preference in the range of 1.0 to 2.0% by weight.

[0050] The first propylene-ethylene random copolymer (R-PP1) preferably has a cold xylene soluble content (XCS), determined according to ISO 16152 analysis, in the range of 0.2 to 5.0% by weight, more preferably in the range of 0.3 to 3.0% by weight, most preferably in the range of 0.4 to 1.0% by weight.

[0051] The first random copolymer of propylene-ethylene (R-PP1) preferably has a melting temperature (Tm), determined by differential scanning calorimetry (DSC), in the range of 130 to 155 °C, more preferably in the range of 136 to 151 °C, with the highest preference in the range of 142 to 148 °C.

[0052] The first random copolymer of propylene-ethylene (R-PP1) preferably has a crystallization temperature (Tc), determined by differential scanning calorimetry (DSC), in the range of 110 to 125 °C, more preferably in the range of 112 to 122 °C, with maximum preference in the range of 114 to 119 °C.

[0053] The first random copolymer of propylene-ethylene (R-PP1) has, Petition 870250078585, dated 03 / 09 / 2025, page 22 / 167 12 / 42 preferably, a regiodefect content of 2.1, as determined by 13C-NMR spectroscopy, in the range of 0.05 to 1.40 mol%, more preferably in the range of 0.10 to 1.10 mol%, with the highest preference in the range of 0.20 to 0.90 mol%.

[0054] The presence of 2,1 regiodefects is an indication that the first propylene-ethylene random copolymer (R-PP1) was polymerized in the presence of a single-site catalyst (SSC).

[0055] Therefore, it is still preferable that the first random copolymer of propylene-ethylene (R-PP1) has been polymerized in the presence of a single-site catalyst (SSC). Second random copolymer of propylene-ethylene (R-PP2)

[0056] The second random copolymer of propylene-ethylene (R-PP2) is present in the polypropylene (PC) composition in an amount ranging from 10.0 to 50.0% by weight, preferably from 12.0 to 48.0% by weight, with the greatest preference for 15.0 to 45.0% by weight, relative to the total weight of the polypropylene (PC) composition.

[0057] As should be understood by those skilled in the art, in contrast to the heterophasic random copolymer of propylene-ethylene (RAHECO), the second random copolymer of propylene-ethylene (R-PP2) is monophasic.

[0058] The second random copolymer of propylene-ethylene (R-PP2) is a random copolymer with propylene monomer units and ethylene comonomer units.

[0059] The second random copolymer of propylene-ethylene (R-PP2) has a melt flow rate (MFR2), determined according to ISO 1133 at 230 °C and 2.16 kg, in the range of 7.0 to 20.0 g / 10 min, more preferably in the range of 8.0 to 17.0 g / 10 min, with the highest preference in the range of 9.0 to 14.0 g / 10 min.

[0060] The second random copolymer of propylene-ethylene (R-PP2) preferably has an ethylene (C2) content, determined by quantitative 13C-NMR spectroscopy, in the range of 1.0 to 5.5% by weight, more preferably Petition 870250078585, dated 03 / 09 / 2025, page 23 / 167 13 / 42 in the range of 1.5 to 4.0% by weight, with the highest preference in the range of 2.0 to 3.0% by weight.

[0061] The second random copolymer of propylene-ethylene (R-PP2) preferably has a cold soluble xylene content (XCS), determined according to ISO 16152 analysis, in the range of 0.2 to 5.0% by weight, more preferably in the range of 0.3 to 3.0% by weight, with the highest preference in the range of 0.4 to 1.0% by weight.

[0062] The second random copolymer of propylene-ethylene (R-PP2) preferably has a melting temperature (Tm), determined by differential scanning calorimetry (DSC), in the range of 125 to 145 °C, more preferably in the range of 126 to 135 °C, with the highest preference in the range of 127 to 130 °C.

[0063] The second random copolymer of propylene-ethylene (R-PP2) preferably has a crystallization temperature (Tc), determined by differential scanning calorimetry (DSC), in the range of 100 to 120 °C, more preferably in the range of 103 to 115 °C, with the highest preference in the range of 106 to 110 °C.

[0064] The second random copolymer of propylene-ethylene (R-PP2) preferably has a regiodefect content of 2.1, as determined by 13C-NMR spectroscopy, in the range of 0.05 to 1.40 mol%, more preferably in the range of 0.10 to 1.10 mol%, with the highest preference in the range of 0.20 to 0.90 mol%.

[0065] The presence of 2,1 regiodefects is an indication that the second random copolymer of propylene-ethylene (R-PP2) was polymerized in the presence of a single-site catalyst (SSC).

[0066] Therefore, it is still preferable that the second random copolymer of propylene-ethylene (R-PP2) has been polymerized in the presence of a single-site catalyst (SSC). Coating layer and core layer i) The coating layer (A) and the core layer (B) each comprise at least 90% by weight, Petition 870250078585, dated 03 / 09 / 2025, page 24 / 167 14 / 42 preferably at least 95% by weight, with a maximum preference of at least 97% by weight, of a polypropylene or a mixture of polypropylenes. ii) The compositions of the coating layer (A) and the core layer (B) may be the same or different. Preferably, the composition of the coating layer (A) is the same as the composition of the core layer (B). iii) In a broader sense, any polypropylene can be used for the outer layer (A) and the core layer (B). iv) However, it is preferable that the coating layer (A) comprises at least 90% by weight, more preferably at least 95% by weight, and most preferably at least 97% by weight, of a heterophasic propylene-ethylene copolymer or a mixture of heterophasic propylene-ethylene copolymers. (v) Similarly, it is preferable that the core layer (B) comprises at least 90% by weight, more preferably at least 95% by weight, and most preferably at least 97% by weight, of a heterophasic propylene-ethylene copolymer or a mixture of heterophasic propylene-ethylene copolymers. vi) It is particularly preferred that the coating layer (A) comprises at least 90% by weight, more preferably at least 95% by weight, and most preferably at least 97% by weight, of a polypropylene (PC') composition comprising: i) 15 to 45% by weight, based on the total weight of the polypropylene (PC') composition, of a heterophasic random copolymer of propylene-ethylene (RAHECO'), wherein the heterophasic random copolymer of propylene-ethylene Petition 870250078585, dated 03 / 09 / 2025, page 25 / 167 15 / 42 (RAHECO') includes: a1) a crystalline matrix (M) that is a random copolymer of propylene-ethylene; and b1) an amorphous elastomer of propylene-ethylene (E), and ii) 55 to 85% by weight, based on the total weight of the polypropylene composition (PC'), of a heterophasic copolymer of propylene-ethylene (HECO), wherein the heterophasic copolymer of propylene-ethylene (HECO) comprises: a2) a crystalline matrix (M) that is a propylene homopolymer; and b2) an amorphous propylene-ethylene elastomer (E).

[0067] The combined amounts of heterophasic random copolymer of propylene-ethylene (RAHECO') and heterophasic copolymer of propylene-ethylene (HECO) are at least 90% by weight, preferably 95% by weight and, most preferably, 97% by weight, relative to the total weight of the polypropylene composition (PC').

[0068] More preferably, the polypropylene (PC') composition comprises: i) 20 to 40% by weight, based on the total weight of the polypropylene (PC') composition, of the heterophasic random copolymer of propylene-ethylene (RAHECO'), and ii) 60 to 80% by weight, based on the total weight of the polypropylene (PC') composition, of the heterophasic copolymer of propylene-ethylene (HECO).

[0069] More preferably, the polypropylene (PC') composition comprises: i) 25 to 35% by weight, based on the total weight of the polypropylene (PC') composition, of the heterophasic random copolymer of propylene-ethylene (RAHECO'), and Petition 870250078585, dated 03 / 09 / 2025, page 26 / 167 16 / 42 ii) 65 to 75% by weight, based on the total weight of the polypropylene (PC') composition, of the propylene-ethylene heterophasic copolymer (HECO).

[0070] More particularly, it is preferred that the core layer (B) comprise at least 90% by weight, more preferably at least 95% by weight, and most preferably at least 97% by weight, of a polypropylene (PC') composition comprising: i) 15 to 45% by weight, based on the total weight of the polypropylene (PC') composition, of a heterophasic random copolymer of propylene-ethylene (RAHECO'), wherein the heterophasic random copolymer of propylene-ethylene (RAHECO') comprises: a1) a crystalline matrix (M) that is a random copolymer of propylene-ethylene; and b1) an amorphous elastomer of propylene-ethylene (E), and ii) 55 to 85% by weight, based on the total weight of the polypropylene composition (PC'), of a heterophasic copolymer of propylene-ethylene (HECO), wherein the heterophasic copolymer of propylene-ethylene (HECO) comprises: a2) a crystalline matrix (M) that is a propylene homopolymer; and b2) an amorphous propylene-ethylene elastomer (E).

[0071] The combined amounts of heterophasic random copolymer of propylene-ethylene (RAHECO') and heterophasic copolymer of propylene-ethylene (HECO) are at least 90% by weight, preferably 95% by weight and, most preferably, 97% by weight, relative to the total weight of the polypropylene composition (PC').

[0072] More preferably, the polypropylene (PC') composition of the core layer (B) comprises: Petition 870250078585, dated 03 / 09 / 2025, page 27 / 167 17 / 42 i) 20 to 40% by weight, based on the total weight of the polypropylene (PC') composition, of the heterophasic random copolymer of propylene-ethylene (RAHECO'), and ii) 60 to 80% by weight, based on the total weight of the polypropylene (PC') composition, of the heterophasic copolymer of propylene-ethylene (HECO).

[0073] More preferably, the polypropylene (PC') composition of the core layer (B) comprises: i) 25 to 35% by weight, based on the total weight of the polypropylene (PC') composition, of the heterophasic random copolymer of propylene-ethylene (RAHECO'), and ii) 65 to 75% by weight, based on the total weight of the polypropylene (PC') composition, of the heterophasic copolymer of propylene-ethylene (HECO).

[0074] If components other than the random heterophasic propylene-ethylene copolymer (RAHECO') and the heterophasic propylene-ethylene copolymer (HECO) are present, it is preferable that these be additives.

[0075] A person skilled in the art will be able to select suitable additives that are well known in the art.

[0076] The additives are preferably selected from pigments, antioxidants, UV stabilizers, anti-scratch agents, mold release agents, acid scavengers, lubricants, antistatic agents and mixtures thereof.

[0077] It is understood that the additive content includes any carrier polymers used to introduce the additives into the polypropylene (PC') composition, i.e., standard blend carrier polymers. An example of such a carrier polymer would be a polypropylene homopolymer in powder form.

[0078] The individual components will now be described in more detail. Heterophasic random copolymer of propylene-ethylene (RAHECO')

[0079] The heterophasic random copolymer of propylene-ethylene (RAHECO') is Petition 870250078585, dated 03 / 09 / 2025, page 28 / 167 18 / 42 supplied in an amount ranging from 15.0 to 45.0% by weight, preferably ranging from 20.0 to 40.0% by weight, with the highest preference for ranging from 25.0 to 35.0% by weight, relative to the total weight of the polypropylene (PC') composition.

[0080] The heterophasic random copolymer of propylene-ethylene (RAHECO') comprises: a1) a crystalline matrix (M) that is a random copolymer of propylene ethylene; and b1) an amorphous propylene-ethylene elastomer (E).

[0081] The heterophasic random copolymer of propylene-ethylene (RAHECO) preferably has a melt flow rate (MFR2), determined according to ISO 1133 at 230 °C and 2.16 kg, in the range of 0.1 to 10.0 g / 10 min, more preferably in the range of 0.3 to 5.0 g / 10 min, with the highest preference in the range of 0.5 to 2.0 g / 10 min.

[0082] The heterophasic random copolymer of propylene-ethylene (RAHECO) has a melting temperature (Tm), determined by differential scanning calorimetry (DSC), in the range of 130 to 155 °C, most preferably in the range of 134 to 150 °C, with the highest preference in the range of 138 to 145 °C.

[0083] The crystal matrix (M) of the heterophasic random copolymer of propylene-ethylene (RAHECO') is preferentially free of 2,1 regiodefects, as determined by 13C-NMR spectroscopy.

[0084] The absence of 2,1 regiodefects is an indication that the heterophasic random copolymer of propylene-ethylene (RAHECO') was polymerized in the presence of a Ziegler-Natta catalyst.

[0085] Therefore, preferably, the heterophasic random copolymer of propylene-ethylene (RAHECO') was polymerized in the presence of a Ziegler-Natta catalyst.

[0086] The random heterophasic copolymer of propylene-ethylene (RAHECO') preferably has an ethylene content (C2(total)), determined by CRYSTEX QC analysis, in the range of 3.0 to 15.0% by weight, with greater preference in the range Petition 870250078585, dated 03 / 09 / 2025, page 29 / 167 19 / 42 from 5.0 to 13.0% by weight, and with the highest preference in the range of 7.0 to 11.0% by weight.

[0087] The propylene-ethylene random heterophasic copolymer (RAHECO') preferably has a soluble fraction (SF) content, determined by CRYSTEX QC analysis, in the range of 10 to 45% by weight, more preferably in the range of 13 to 35% by weight, with the highest preference in the range of 16 to 25% by weight.

[0088] The propylene-ethylene random heterophasic copolymer (RAHECO') preferably has an ethylene content in the soluble fraction (C2(SF)), determined by CRYSTEX QC analysis, in the range of 17.0 to 60.0% by weight, more preferably in the range of 20.0 to 50.0% by weight, with the highest preference in the range of 25.0 to 40.0% by weight.

[0089] The propylene-ethylene random heterophasic copolymer (RAHECO') preferably has an intrinsic viscosity of the soluble fraction (iV(SF)), determined by CRYSTEX QC analysis, in the range of 1.20 to 4.50 dL / g, more preferably in the range of 2.00 to 4.00 dL / g, with maximum preference in the range of 2.40 to 3.40 dL / g.

[0090] The heterophasic random copolymer of propylene-ethylene (RAHECO') preferably has a crystalline fraction (CF) content, determined by CRYSTEX QC analysis, in the range of 55 to 90% by weight, more preferably in the range of 65 to 87% by weight, with the highest preference in the range of 75 to 84% by weight.

[0091] The propylene-ethylene random heterophasic copolymer (RAHECO') preferably has an ethylene content in the crystalline fraction (C2(CF)), determined by CRYSTEX QC analysis, in the range of 1.0 to 8.0% by weight, more preferably in the range of 2.0 to 7.0% by weight, with the highest preference in the range of 3.0 to 6.0% by weight.

[0092] The heterophasic random copolymer of propylene-ethylene (RAHECO') preferably has an intrinsic viscosity of the crystalline fraction (iV(CF)), determined by CRYSTEX QC analysis, in the range of 1.20 to 4.50 dL / g, more preferably in the range of 2.00 to 4.00 dL / g, with maximum preference in the range of Petition 870250078585, dated 03 / 09 / 2025, page 30 / 167 20 / 42 2.60 to 3.60 dL / g.

[0093] It is also preferable that the ratio of the intrinsic viscosity of the soluble and crystalline fractions, (iV(SF) / iV(CF)), determined by CRYSTEX QC analysis, be in the range of 0.50 to 2.00, more preferably in the range of 0.75 to 1.50, with the highest preference in the range of 0.90 to 1.10.

[0094] It is particularly preferred that the heterophasic random copolymer of propylene-ethylene (RAHECO') of the polypropylene (PC') composition of the coating layer and / or core be the same as the heterophasic random copolymer of propylene-ethylene (RAHECO) of the polypropylene (PC) composition of the sealing layer. Heterophasic propylene-ethylene copolymer (HECO)

[0095] The heterophasic propylene-ethylene copolymer (HECO) is supplied in an amount in the range of 55.0 to 85.0% by weight, more preferably in the range of 60.0 to 80.0% by weight, and most preferably in the range of 65.0 to 75.0% by weight, relative to the total weight of the polypropylene composition (PC').

[0096] The heterophasic propylene-ethylene copolymer (HECO) comprises: a2) a crystalline matrix (M) which is a propylene homopolymer; and b2) an amorphous propylene-ethylene elastomer (E).

[0097] The heterophasic propylene-ethylene copolymer (HECO) preferably has a melt flow rate (MFR2), determined according to ISO 1133 at 230 °C and 2.16 kg, in the range of 0.1 to 6.0 g / 10 min, more preferably in the range of 0.3 to 3.0 g / 10 min, with the highest preference in the range of 0.5 to 1.0 g / 10 min.

[0098] The heterophasic propylene-ethylene copolymer (HECO) has a melting temperature (Tm), determined by differential scanning calorimetry (DSC), in the range of 150 to 170 °C, most preferably in the range of 155 to 168 °C, with the maximum preference in the range of 160 to 167 °C.

[0099] The crystalline matrix (M) of the heterophasic propylene-ethylene copolymer (HECO) is preferentially free of 2,1 regiodefects, as determined by 13C-NMR spectroscopy. Petition 870250078585, dated 03 / 09 / 2025, page 31 / 167 21 / 42

[0100] The absence of 2,1 regiodefects is an indication that the heterophasic propylene-ethylene copolymer (HECO') was polymerized in the presence of a Ziegler-Natta catalyst.

[0101] Therefore, preferably, the heterophasic copolymer of propylene ethylene (HECO) was polymerized in the presence of a Ziegler-Natta catalyst.

[0102] The heterophasic propylene-ethylene copolymer (HECO) preferably has an ethylene content (C2(total)), determined by CRYSTEX QC analysis, in the range of 3.0 to 15.0% by weight, more preferably in the range of 4.0 to 12.0% by weight, and most preferably in the range of 5.0 to 9.0% by weight.

[0103] The heterophasic propylene-ethylene copolymer (HECO) preferably has a soluble fraction (SF) content, determined by CRYSTEX QC analysis, in the range of 5 to 30% by weight, more preferably in the range of 10 to 25% by weight, with the highest preference in the range of 12 to 20% by weight.

[0104] The heterophasic propylene-ethylene copolymer (HECO) preferably has an ethylene content in the soluble fraction (C2(SF)), determined by CRYSTEX QC analysis, in the range of 17.0 to 60.0% by weight, more preferably in the range of 20.0 to 50.0% by weight, and most preferably in the range of 30.0 to 45.0% by weight.

[0105] The heterophasic propylene-ethylene copolymer (HECO) preferably has an intrinsic viscosity of the soluble fraction (iV(SF)), determined by CRYSTEX QC analysis, in the range of 1.20 to 4.50 dL / g, more preferably in the range of 1.70 to 4.00 dL / g, with maximum preference in the range of 2.20 to 3.30 dL / g.

[0106] The heterophasic propylene-ethylene copolymer (HECO) preferably has a crystalline fraction (CF) content, determined by CRYSTEX QC analysis, in the range of 70 to 95% by weight, more preferably in the range of 75 to 90% by weight, with the highest preference in the range of 80 to 88% by weight.

[0107] The first heterophasic propylene-ethylene copolymer (HECO) preferably has an ethylene content in the crystalline fraction (C2(CF)), determined Petition 870250078585, dated 03 / 09 / 2025, page 32 / 167 22 / 42 by CRYSTEX QC analysis, in the range of 1.0 to 8.0% by weight, with more preference in the range of 2.0 to 6.0% by weight, with maximum preference in the range of 2.5 to 5.0% by weight.

[0108] The heterophasic propylene-ethylene copolymer (HECO) preferably has an intrinsic viscosity of the crystalline fraction (iV(CF)), determined by CRYSTEX QC analysis, in the range of 1.20 to 4.50 dL / g, more preferably in the range of 2.00 to 4.00 dL / g, with the highest preference in the range of 2.50 to 3.50 dL / g.

[0109] It is also preferable that the intrinsic viscosity ratio of the soluble and crystalline fractions, (iV(SF) / iV(CF)), determined by CRYSTEX QC analysis, be in the range of 0.50 to 2.00, more preferably in the range of 0.75 to 1.50, with the highest preference in the range of 0.90 to 1.10. Multilayer Film (A) As described above, the multilayer film (F) comprises, in a specific order, the following layers: (A) a coating layer; (B) a core layer; and (C) a sealing layer.

[0110] Although other layers may be present, it is preferred that any other layers, if present, be between the coating layer (A) and the core layer (B) or between the core layer (B) and the sealing layer (C), preferably between the coating layer (A) and the core layer (B).

[0111] It is particularly preferred that there are no other layers present, i.e., the multilayer film (F) is a three-layer film, consisting of layers (A), (B) and (C).

[0112] It is preferred that the multilayer film (F) have a thickness in the range of 20 to 150 pm, more preferably 30 to 100 pm, with the maximum preference being 50 to 80 pm.

[0113] It is preferred that: Petition 870250078585, dated 03 / 09 / 2025, p. 33 / 167 23 / 42 a) the coating layer has a thickness in the range of 10 to 40% of the total thickness of the multilayer film (F); b) the core layer has a thickness in the range of 30 to 70% of the total thickness of the multilayer film (F); and c) the sealing layer has a thickness in the range of 10 to 40% of the total thickness of the multilayer film (F).

[0114] It is also preferable that: a) the coating layer has a thickness in the range of 15 to 35% of the total thickness of the multilayer film (F); b) the core layer has a thickness in the range of 35 to 65% of the total thickness of the multilayer film (F); and c) the sealing layer has a thickness in the range of 15 to 35% of the total thickness of the multilayer film (F).

[0115] It is particularly preferable that: a) the coating layer has a thickness in the range of 20 to 30% of the total thickness of the multilayer film (F); b) the core layer has a thickness in the range of 40 to 60% of the total thickness of the multilayer film (F); and c) the sealing layer has a thickness in the range of 20 to 30% of the total thickness of the multilayer film (F).

[0116] It is preferable that the multilayer film (F) have a tensile modulus in the machine direction (TM-MD), measured in accordance with ISO 527-3, in the range of 700 to 1500 MPa, more preferably in the range of 800 to 1300 MPa, and most preferably in the range of 850 to 1100 MPa.

[0117] It is preferable that the multilayer film (F) have a tensile modulus in the transverse direction (TM-TD), measured according to ISO 527-3, in the range of 700 to 1500 MPa, more preferably in the range of 800 to 1300 MPa, with the maximum preference in the range of 850 to 1100 MPa.

[0118] It is preferable that the multilayer film (F) have a dart drop impact resistance (DDI), measured in accordance with ISO 7765-1, Petition 870250078585, dated 03 / 09 / 2025, page 34 / 167 24 / 42 in the 100 to 600 g range, with a greater preference in the 200 to 500 g range, and a maximum preference in the 300 to 400 g range.

[0119] It is preferable that the multilayer film (F) have an opacity value, determined in accordance with ASTM D1003, in the range of 10 to 40%, more preferably in the range of 15 to 35%, with the highest preference in the range of 20 to 30%.

[0120] It is preferable that the multilayer film (F) have a seal initiation temperature (SIT), determined according to the method specified in the measurement methods, in the range of 115 to 130 °C, more preferably in the range of 119 to 128 °C, with the highest preference in the range of 122 to 127 °C.

[0121] It is preferable that the multilayer film (F) have a sealing force before sterilization (bs), determined according to the method specified in the measurement methods, in the range of 15 to 40 N / mm, more preferably in the range of 18 to 35 N / mm, with the maximum preference in the range of 20 to 30 N / mm.

[0122] It is preferable that the multilayer film (F) have a sealing force after sterilization (as), determined according to the method specified in the measurement methods, in the range of 20 to 45 N / mm, more preferably in the range of 23 to 40 N / mm, with the maximum preference in the range of 25 to 35 N / mm.

[0123] It is also preferable that the multilayer film (F) has a sealing strength after sterilization (as) that is at least 92%, preferably at least 95%, most preferably at least 98%, of the sealing strength before sterilization (bs), both determined according to the method specified in the measurement methods.

[0124] Typically, the sealing force after sterilization (as) is not more than 125% of the sealing force before sterilization. EXAMPLES 1. Measurement Methods

[0125] The following definitions of terms and methods of determination apply to the general description of the invention above, including the claims, as well as to the examples below, unless defined otherwise. Petition 870250078585, dated 03 / 09 / 2025, page 35 / 167 25 / 42 Microstructure quantification by NMR spectroscopy

[0126] Quantitative nuclear magnetic resonance (NMR) spectroscopy was used to quantify the regiodefect and comonomer content of the polymers.

[0127] Quantitative 13C{1H} NMR spectra were recorded in the solution state using a Bruker Advance III 400 NMR spectrometer operating at 400.15 and 100.62 MHz for 1H and 13C, respectively. All spectra were recorded using a 10 mm extended temperature probe head optimized for 13C at 125 °C using nitrogen gas for all pneumatics. Approximately 200 mg of material were dissolved in approximately 3 ml of 1,2-tetrachloroethane-d2 (TCE-d2) together with chromium(III)-acetylacetonate (Cr(acac)3) resulting in a 65 mM relaxing agent solution in solvent {singh09}. To ensure a homogeneous solution, after initial sample preparation on a hot block, the NMR tube was further heated in a rotating furnace for at least 1 hour. Upon insertion of the magnet, the tube was rotated at 10 Hz.This configuration was chosen primarily for its high resolution and is quantitatively necessary for accurate quantification of ethylene content. Standard single-pulse excitation was employed without NOE, using an optimized tip angle, a recycle delay of 1, and a two-level WALTZ16 decoupling scheme {zhou07, busico07}. A total of 6144 (6 k) transients were acquired by spectra.

[0128] Quantitative 13C{1H} NMR spectra were processed, integrated, and relevant quantitative properties determined from the integrals using specific computer programs. All chemical shifts were indirectly referenced to the central methylene group of the ethylene block (EEE) at 30.00 ppm using solvent chemical shift. This approach allowed comparable referencing even when this structural unit was not present.

[0129] Characteristic signals corresponding to the incorporation of ethylene were observed {wang00, cheng84, randall89}. Petition 870250078585, dated 03 / 09 / 2025, page 36 / 167 26 / 42

[0130] The comonomer fraction was quantified using the method of Wang et al. {wang00} by integrating multiple signals across the entire spectral region in the 13C{1H} spectra. This method was chosen for its robust nature and ability to account for the presence of region defects when necessary. The integral regions were slightly adjusted to increase applicability across the entire range of comonomer content found.

[0131] For systems in which only isolated ethylene in PPEPP sequences was observed, the method of Wang et al. was modified to reduce the influence of non-zero integrals from sites known to be absent. This approach reduced the overestimation of ethylene content for such systems and was achieved by reducing the number of sites used to determine the absolute ethylene content to . By using this set of sites, the corresponding integral equation becomes Ps = Ia + (0.5 * Ib) Pt = Id + If + Id p = (ps + ρτ) / 2 e = 0.5 * (Ih + (0.5 * Ib)) fE = e / (e + p) using the same notation used in the article by Wang et al. {wang00}.

[0132] The comonomer incorporation percentage by mole was calculated from the mole fraction: E [% in mol] = 100 * fE

[0133] The comonomer incorporation in weight percent was calculated from the mole fraction: E [% by weight] = 100 * (fE * 28.06) / ((fE * 28.06) + ((1-fE) * 42.08))

[0134] Characteristic signals corresponding to regiodefects were observed {resconi00, wang00}. The presence of isolated 2,1-erythro regiodefects was indicated by the presence of two methyl sites at 17.7 and 17.2 ppm and confirmed by other characteristic sites. The presence of a 2,1-erythro regiodefect adjacent to an ethylene unit was indicated by the two Sae signals. Petition 870250078585, dated 03 / 09 / 2025, p. 37 / 167 27 / 42 are inequivalent to 34.9 ppm and 34.7 ppm, respectively, and Τγγ to 34.1 ppm.

[0135] The quantity of isolated 2,1-erythro regiodefects (isolated P2ie) was quantified using the integral mean of the two characteristic methyl sites at 17.7 (Ie8) and 17.4 (Ie6) ppm, respectively: P21e isolated = ( Ie6 + Ie8 ) / 2

[0136] The amount of 2,1 regiodefects adjacent to ethylene (PE21) was quantified using the methine site at 34.1 ppm (Iτγγ): Pe21 = Iτγγ

[0137] The total amount of propene (Ptotal) was quantified based on the methyl region (Ich3) between 23.0 and 19.9 ppm with correction made for sites included in this region not related to propene insertion. The methyl group Pyy resulting from the 2,1 regiodefect adjacent to ethylene is already present in Ich3: Ptotal = IcH3 + 2 * P21e isolated

[0138] Isolated 2,1-erythron regiodefects (isolated P21e) are multiplied by 2 to account for the two (2) propene units in the 2,1-erythron regiodefects.

[0139] The mole percentage of isolated 2,1-erythro regiodefects was quantified relative to the whole propene: [21e] % in mol = 100 * Isolated P21e / Total P

[0140] The mole percentage of 2,1 regiodefects adjacent to ethylene was quantified relative to the whole propene: [E21] % in mol = 100 * PE21 / Ptotal

[0141] The total number of 2.1 regiodefects was quantified as follows:

[21] % in mol = [21e] + [E21]

[0142] Characteristic signals corresponding to other types of regiodefects (insertion 2,1-treo, 3,1) were not observed {resconi00}. zhou07 Zhou, Z., Kuemmerle, R., Qiu, X., Redwine, D., Cong, R., Taha, A., Baugh, D. Winniford, B., J. Mag. Reson. 187 (2007) 225 Petition 870250078585, dated 03 / 09 / 2025, p. 38 / 167 28 / 42 busico07 Busico, V., Carbonniere, P., Cipullo, R., Pellecchia, R., Severn, J., Talarico, G., Macromol. Rapid Commun. 2007, 28, 1128 resconi00 Resconi, L., Cavallo, L., Fait, A., Piemontesi, F., Chem. Rev. 2000, 100, 1253 wang00 Wang, WJ., Zhu, S., Macromolecules 33 (2000), 1157 cheng84 Cheng, HN, Macromolecules 17 (1984), 1950 singh09 Singh, G., Kothari, A., Gupta, V. 28 Polymer Testing. (2009), 475 randall89 Randall, J. Macromol. Sci., Rev. Macromol. Chem. Phys. 1989, C29, 201. analysis of CRYSTEX QC Crystalline and Solution Fraction Method

[0143] The crystalline (CF) and soluble (SF) fractions of the polypropylene (PP) compositions, as well as the comonomer content and intrinsic viscosities of the respective fractions, were analyzed using the CRYSTEX instrument, Polymer Char (Valencia, Spain). Details of the technique and method can be found in the literature (Ljiljana Jeremic, Andreas Albrecht, Martina Sandholzer & Markus Gahleitner (2020) Rapid characterization of high-impact ethylene-propylene copolymer composition by crystallization extraction separation: comparability to standard separation methods, International Journal of Polymer Analysis and Characterization, 25:8, 581-596).

[0144] The crystalline and amorphous fractions are separated by dissolution temperature cycles at 160 °C, crystallization at 40 °C and redissolution in 1,2,4-trichlorobenzene at 160 °C. Quantification of SF and CF and determination of ethylene content (C2) are obtained by means of an integrated infrared detector (IR4) and for the determination of intrinsic viscosity (IV) an online 2-capillary viscometer is used.

[0145] The IR4 detector is a multi-wavelength detector that measures IR absorbance in two different bands (CH3 stretching vibration (centered at approx. 2960 cm-1) and CH stretching vibration (2700-3000 cm-1)) which are used for the determination of ethylene concentration and content in Petition 870250078585, dated 03 / 09 / 2025, page 39 / 167 29 / 42 ethylene-propylene copolymers. The IR4 detector is calibrated with a series of 8 EP copolymers with known ethylene content in the range of 2% by weight to 69% by weight (determined by 13C-NMR) and each at various concentrations, in the range of 2 and 13 mg / ml. To consider both features, concentration and ethylene content simultaneously for various polymer concentrations expected during Crystex analyses, the following calibration equations were applied: Conc = a + b*Abs(CH) + c*(Abs(CH))2 + d*Abs(CH3) + e*(Abs(CH3)2 + f*Abs(CH)*Abs(CH3) (Equation 1) CH3 / 1000C = a + b*Abs(CH) + c*Abs(CH3) + d*(Abs(CH3) / Abs(CH)) + e*(Abs(CH3) / Abs(CH))2 (Equation 2)

[0146] The constants a up to and for equation 1 and a up to f for equation 2 were determined using least squares regression analysis.

[0147] CH3 / IOOOC is converted to ethylene content in % by weight using the following relationship: % by weight (Ethylene in EP Copolymers) = 100 - CH3 / IOOOTC * 0.3 (Equation 3)

[0148] The amounts of Soluble Fraction (SF) and Crystalline Fraction (CF) are correlated through XS calibration to the amount of “Cold Soluble in Xylene” (XCS) and, respectively, the Cold Insoluble in Xylene (XCI) fractions, determined according to the standard gravimetric method in accordance with ISO16152. The XS calibration is obtained by testing various EP copolymers with XS content in the range of 2-31% by weight. The determined XS calibration is linear: % by weight of XS = 1.01 * % by weight of SF (Equation 4)

[0149] The intrinsic viscosity (IV) of the parent EP copolymer and its soluble and crystalline fractions are determined using a 2-capillary in-line viscometer and are correlated to the corresponding IVs determined by the standard decalin method according to ISO 1628-3. Calibration is achieved with several EP PP copolymers with IV = 2. Petition 870250078585, dated 03 / 09 / 2025, page 40 / 167 30 / 42 dl / g. The determined calibration curve is linear: IV (dl / g) = a* Vsp / c (equation 5)

[0150] The samples to be analyzed are weighed at concentrations of 10 mg / ml to 20 mg / ml. To avoid injecting possible gels and / or polymers that do not dissolve in TCB at 160 °C, such as PET and PA, the weighted sample was packed in a stainless steel mesh MW 0.077 / D 0.05 mm.

[0151] After automated filling of the flask with 1,2,4-TCB containing 250 mg / l of 2,6-tert-butyl-4-methylphenol (BHT) as an antioxidant, the sample is dissolved at 160 °C until complete dissolution is obtained, usually for 60 min, with constant stirring at 400 rpm. To prevent sample degradation, the polymer solution is covered with a N2 atmosphere during dissolution.

[0152] A defined volume of the sample solution is injected into the column packed with inert support where sample crystallization and separation of the soluble fraction from the crystalline part is occurring. This process is repeated twice. During the first injection, the entire sample is measured at high temperature, determining the IV[dl / g] and C2[% by weight] of the PP composition. During the second injection, the soluble fraction (at low temperature) and the crystalline fraction (at high temperature) with the crystallization cycle are measured (% by weight of SF, % by weight of C2, IV). Fusion Flow Rate

[0153] The melt flow rate (MFR) was determined according to ISO 1133 and is indicated in g / 10 min. The MFR is an indication of the flowability and therefore the processability of the polymer. The higher the melt flow rate, the lower the viscosity of the polymer. The MFR2 of polypropylene was determined at a temperature of 230 °C and a load of 2.16 kg. Density:

[0154] Density was measured according to ISO 1183-187. Sample preparation was performed by compression molding according to Petition 870250078585, dated 03 / 09 / 2025, page 41 / 167 31 / 42 the ISO 1872-2:2007 standard.

[0155] The xylene-soluble fraction at room temperature (XCS, % by weight): The amount of xylene-soluble polymer was determined at 25 °C according to ISO 16152; 5th edition; 1 / 07 / 2005.

[0156] DSC analysis, melting temperature (Tm) and heat of fusion (Hf), crystallization temperature (Tc) and heat of crystallization (Hc): measured with a TA Instrument Q200 differential scanning calorimetry (DSC) on samples of 5 to 7 mg. DSC was performed according to ISO 11357 / part 3 / method C2 in a heat / cold / heat cycle that has a scan rate of 10 °C / min in the temperature range of -30 to +225 °C. The crystallization temperature (Tc) and enthalpy of crystallization (Hc) were determined from the cooling step, while the melting temperature (Tm) and enthalpy of fusion (Hm) were determined from the second heating step. DDI ISO 7765-1:1988 / Method A

[0157] This test method covers the determination of the energy that causes films to fail under specific impact conditions of a dart falling freely from a specified height that would result in the failure of 50% of the tested specimens (Staircase A method). A uniform increment of missile mass is employed during the test and the missile weight is decreased or increased by the uniform increment after the test of each specimen, depending on the result (failure or no failure) observed for the specimen. Standard conditions: Conditioning time: > 96 h Test temperature: 23 °C Dart head material: phenolic. Dart diameter: 38 mm. Drop height: 660 mm. Results: • Impact failure mass [g] Petition 870250078585, dated 03 / 09 / 2025, page 42 / 167 32 / 42 • Minimum thickness [mm] • Maximum thickness [mm]

[0158] Tests according to ISO7765-1:1988 / Method A were performed on films with the indicated thickness and produced as described below in Examples and reported in grams (g).

[0159] DDI per unit thickness (in g / micron) is calculated by dividing DDI (in grams) by the film thickness (in microns) Opacity

[0160] Opacity was determined according to ASTM D1003-00 directly on the multilayer film produced in the experimental section. Seal range experiments (SIT, maximum sealing force and SET)

[0161] This method is used to determine the sealing window (sealing temperature range) of films. The procedure is similar to the hot adhesion test and is performed on the same machine. In contrast to the hot adhesion test, the determined sealing range corresponds to the seal strength after cooling (a delay time of 30 s). The conditions used are as follows: • Sealing time (1 s) • Sealing pressure (0.4 N / mm2) • Delay time (30 s) • Clamp separation rate (42 mm / s) Sealing range = (Initial sealing temperature to final sealing temperature)

[0162] The results obtained provide a quantitatively useful indication of the sealing strength of the films and indicate the temperature range for the ideal seal.

[0163] The lower limit (Sealing Initiation Temperature - SIT) is the sealing temperature at which an average sealing force of 5 N is measured (i.e., the lowest temperature at which such Petition 870250078585, dated 03 / 09 / 2025, page 43 / 167 33 / 42 force is measured). The upper limit (Sealing End Temperature - SET) is identified as the first sealing temperature at which at least two specimens exhibited a burn failure mode. The maximum sealing force corresponds to the highest sealing force measured.

[0164] The temperature range is set to 5 °C by default, but may be reduced to 1 °C when the curve shows a sharp increase or decrease in force values ​​between two temperature steps. This is done to better represent a curve profile.

[0165] Unlike the ASTM F1921-12 standard, the seal pressure, cooling time, and test speed test parameters are modified. The determination of the force / temperature curve continues until thermal failure of the film. In addition to the failure mode evaluations described in the standard, additional failure modes are used. Sealing resistance

[0166] Thermal sealing experiments were performed on at least 3 film samples 85 mm wide by 200 mm long cut in the machine direction. Teflon-coated steel heating rods 5 mm x 150 mm were set to a temperature of 110 °C. Two films were sealed by positioning, one on top of the other, using a sealing time of 0.5 s and a pressure of 0.67 N / mm2. The resulting sealed area was 85 mm x 5 mm. The specimens were then conditioned for 7 days (± 24 h) at 23 °C (± 2 °C) / 50% RH (± 10%). Ten specimens, 15 mm wide, were cut and tensile tested at 23 °C (± 2 °C) / 50% RH (± 10%) on a Universal Testing Machine (Zwick Z005). A gripping distance of 100 mm and a test speed of 200 mm / min were used. Yield strength and maximum strength were measured for each test specimen. Basic sealing: • Film width: 85 mm • Film length: > 200 mm • Sealed seam width: 5 mm Petition 870250078585, dated 03 / 09 / 2025, page 44 / 167 34 / 42 • Sealing temperature: 110 °C • Sealing pressure: 0.67 N / mm2 • Sealing time: 0.5 s • Sealing jaws: Teflon coated Conditioning • Conditioning time: 7 days (± 24 h) at 23 °C (± 2 °C) / 50% RH (± 10%) Thermal sealing resistance: • Test temperature: 23 °C (± 2 °C) / 50% RH (± 10%) • Specimen width: 15 mm • Grip distance: 100 mm • Test speed: 200 mm / min • Test device: Universal Testing Machine Traction module

[0167] The tensile modulus in the machine and in the transverse direction was determined according to ISO 527-3 at 23 °C in multilayer films produced in the experimental section. The test was performed at a transverse head speed of 1 mm / min. Steam sterilization

[0168] Steam sterilization was performed on a Systec D series machine (Systec Inc., USA). Samples were heated at a rate of 5 °C / min from 23 °C. After being held for 30 min at 130 °C, they were immediately removed from the steam sterilizer and stored at room temperature before processing or testing. 2. Examples 2.1 Synthesis of heterophasic propylene-ethylene copolymers (RAHECO, HECO1 and HECO2)

[0169] For the HECO2 polymerization process, a Ziegler-Natta type catalyst was used, as used in the inventive examples of document WO2016 / 066446 A1 and pre-polymerized with vinylcyclohexane to obtain the Petition 870250078585, dated 03 / 09 / 2025, p. 45 / 167 35 / 42 nucleation with poly(vinylcyclohexane).

[0170] Nucleation by prepolymerization with vinylcyclohexane is described in detail in documents EP290256 B1 and EP2960279B1.

[0171] For the polymerization process of RAHECO and HECO 1, the same catalyst was used, except that no prepolymerization with vinylcyclohexane was carried out (i.e., simply the catalyst used for the inventive examples of document WO 2016 / 066446 A1 was used).

[0172] The catalyst systems defined above were used in combination with triethylaluminum (TEAL) as a cocatalyst and dicyclopentadienyldimethoxysilane (Donor D) as an external donor.

[0173] Subsequent polymerizations were carried out under the following conditions: Table 1 Polymerization conditions for heterophasic propylene-ethylene copolymers RAHECO HECO1 HECO2 Pre-polymerization [Co] / [ED] [mol / mol] 9.5 10.0 8.0 [Co] / [Ti] [mol / mol] 180 200 173 Temperature [°C] 30 30 30 Residence time [min] 15 15 15 Cycle reactor Temperature [°C] 80 80 80 Division [% by weight] 36 41 39 H2 / C3 [mol / kmol] 0.24 0.30 0.40 C2 / C3 [mol / kmol] 3.5 0.0 0.0 MFR2 [g / 10 min] 0.70 0.85 2.40 C2 [% by weight] 2.5 0.0 0.0 Petition 870250078585, dated 03 / 09 / 2025, page 46 / 167 36 / 42 RAHECO HECO1 HECO2 [weight] 1st Gas-phase reactor Temperature [°C] 80 80 80 Division [% by weight] 46 42 50 H2 / C3 [mol / kmol] 2.3 2.9 7.0 C2 / C3 [mol / kmol] 5.3 0.0 0.0 MFR2 [g / 10 min] 0.70 0.85 2.4 XCS [% by weight] 8.0 1.7 1.8 C2 [% by weight] 4.0 0.0 0.0 2nd Gas-phase reactor Temperature [°C] 75 75 75 Division [% by weight] 18 17 11 H2 / C3 [mol / kmol] 80 60 116 C2 / C3 [mol / kmol] 290 480 210 MFR2 [g / 10 min] 0.80 0.85 3.00 C2 [% by weight] 9.5 7.7 4.9 Final properties (pellet) MFR2 [g / 10 min] 0.80 0.85 3.00 C2 [% by weight] 9.5 7.7 4.9 SF [% by weight] 21.1 14.4 11.2 Petition 870250078585, dated 03 / 09 / 2025, p. 47 / 167 37 / 42 RAHECO HECO1 HECO2 [weight] C2(SF) [% by weight] 30.2 37.5 29.1 iV(SF) [dl / g] 2.89 2.83 2.02 CF [% by weight] 78.2 85.6 88.8 C2(CF) [% by weight] 4.9 3.4 2.2 iV(CF) [dl / g] 3.08 3.02 2.66 iV(SF) / iV(CF) [-] 0.94 0.94 0.76 Tm [°C] 141 165 168

[0174] The matrices of each of RAHECO, HECO1 and HECO2 are free of 2,1 regiodefects.

[0175] RAHECO was compounded in a Coperion ZSK 47 co-rotating twin-screw extruder at 220 °C with 0.19% by weight of an antioxidant mixture (Irganox B215FF from BASF AG, Germany; this is a 1:2 mixture of pentaerythryltetrakyl(3-(3',5'-di-tert-butyl-4-hydroxyphenyl)propionate, CAS No. 6683-19-8, and Tris(2,4-di-t-butylphenyl)phosphite, CAS No. 31570-04-4); 0.05% by weight of calcium stearate (CAS No. 1592-23-0, commercially available from Faci, Italy).

[0176] HECO1 was compounded in a Coperion ZSK 47 co-rotating twin-screw extruder at 220 °C with 0.15 wt% pentaerythrityl-tetrakis(3-(3',5'-di-tert-butyl-4-hydroxyphenyl)-propionate (available as Irganox 1010 from BASF AG, Germany; CAS No. 6683-19-8); and 0.05 wt% calcium stearate (CAS No. 1592-23-0, commercially available from Faci, Italy).

[0177] HECO2 was compounded in a Coperion ZSK 47 co-rotating twin-screw extruder at 220 °C with 0.05 wt% of pentaerythrityl tetrakis(3-(3',5'-di-tert-butyl-4-hydroxyphenyl)-propionate (available as Irganox 1010 from BASF). Petition 870250078585, dated 03 / 09 / 2025, page 48 / 167 38 / 42 BASF AG, Germany; CAS No. 6683-19-8); 0.10% by weight of tris(2,4-di-t-butylphenyl) phosphite (available as Irgafos 168 from BASF AG, Germany; CAS No. 3157004-4); 0.03% by weight of synthetic hydrotalcite (available as Hycite 713 from BASF AG, Germany; CAS No. 11097-59-9); and 0.05% by weight of a nucleating agent (available as Hyperform HPN-20E from Milliken, USA; CAS No. (of the main component) 491589-22-1). 2.2 Random copolymers of propylene-ethylene (R-PP1 and R-PP2)

[0178] The catalyst used in the polymerization process for the random copolymers of propylene-ethylene R-PP1 and R-PP2 was prepared as follows:

[0179] The metallocene MC1 (rac-anti-dimethylsilandi-yl(2-methyl-4-phenyl5-methoxy-6-tert-butyl-indenyl)(2-methyl-4-(4-tert-butylphenyl)indenyl)zirconium dichloride) was synthesized as described in document WO 2013 / 007650.

[0180] The catalyst was prepared using metallocene MC1 and a MAO and trityl tetraquis(pentafluorophenyl)borate catalyst system according to Catalyst 3 of WO 2015 / 11135 with the caveat that the surfactant is 2,3,3,3-tetrafluoro-2-(1,1,2,2,3,3,3-heptafluoropropoxy)-1-propanol. Table 2 Polymerization conditions for propylene-ethylene random copolymers R-PP1 R-PP2 Pre-polymerization Temperature °C 17 20 Residence time min 0.4 0.4 Cycle reactor Temperature °C 68 65 Feed H2 / C3 ratio [mol / kmol] 0.1 0.1 Feed C2 / C3 ratio [mol / kmol] 15.2 32.1 Petition 870250078585, dated 03 / 09 / 2025, page 49 / 167 39 / 42 Feeding Division [% by weight] 63 52 MFR2 [g / 10 min] 4.48 2.67 C2 content [% by weight] 0.51 2.20 First GPR Temperature [°C] 83 83 H2 / C3 ratio [mol / kmol] 0.7 1.2 C2 / C3 ratio [mol / kmol] 97.6 119.8 Division [% by weight] 37 48 Total C2 pellet [% by weight] 1.1 2.5 2.1 regiodefects [% by mol] 0.6 0.5 MFR2 [g / 10 min] 2.0 1.7 Tm [°C] 145 128 XCS [% by weight] 0.51 0.57

[0181] R-PP1 was compounded in a Coperion ZSK 47 co-rotating twin-screw extruder at 220 °C with 0.05 wt% pentaerythrityl-tetrakis(3-(3',5'-di-tert-butyl-4-hydroxyphenyl)-propionate (available as Irganox 1010 from BASF AG, Germany; CAS No. 6683-19-8); 0.05 wt% tris(2,4-di-tert-butylphenyl) phosphite (available as Irgafos 168 from BASF AG, Germany; CAS No. 3157004-4); 0.03 wt% synthetic hydrotalcite (available as Hycite 713 from BASF AG, Germany; CAS No. 11097-59-9); and 0.08 wt% of a nucleating agent. (available as ADK Stab NA-71 from Adeka Corporation, Germany; Petition 870250078585, dated 03 / 09 / 2025, page 50 / 167 40 / 42 CAS No. (of main component) 85209-93-4).

[0182] R-PP2 was compounded in a Coperion ZSK 47 co-rotating twin-screw extruder at 220 °C with 0.20% by weight of erucamide (available as Crodamide ER beads from Croda International, UK; CAS No. 112-84-5); 0.18% by weight of amorphous silica (available as Sylobloc 45B from Grace GmbH, Germany; CAS No. 7631-86-9); 0.10% by weight of an antioxidant mixture (available as Irganox B215FF from BASF AG, Germany; this is a 1:2 mixture of pentaerythryl-tetrakis(3-(3',5'-di-tert-butyl-4-hydroxyphenyl)-propionate, CAS No. 6683-19-8, and Tris(2,4-di-t-butylphenyl)phosphite, CAS No. 31570-04-4); and 0.04% by weight of calcium stearate (available from Faci, Italy; CAS No. 1592-23-0) and 2.0% by weight of the propylene homopolymer described in document EP 3 184 587, Table 1, IE2.

[0183] Furthermore, R-PP2 was viscously broken down using 2,5-bis(tert-butylperoxy)-2,5-dimethylhexane to achieve an MFR2 of 11.0 g / 10 min. The XCS, Tm, C2 (total) and regiodefect content of 2,1 were not altered during the viscoreduction process. 2.3 Composition of inventive and comparative multilayer films

[0184] The compositions for each layer were prepared based on the recipes indicated in Table 3, assembling in a Coperion ZSK 40 co-rotating twin-screw extruder at 220 °C.

[0185] Three-layer films are produced on Collin's laboratory-scale blown film line, 60 µm film thickness, BUR 1:2.5, melt temperature 210 °C. The film thickness distribution is 25% coating, 50% core, and 25% sealing layer.

[0186] The properties of the inventive and comparative compositions are given in Table 4. Petition 870250078585, dated 03 / 09 / 2025, page 51 / 167 41 / 42 Table 3 Recipes for inventive and comparative examples CE1 IE1 IE2 IE3 RAHECO sheathing layer [% by weight] 30 30 30 30 HECO1 [% by weight] 70 70 70 70 RAHECO core layer [% by weight] 30 30 30 30 HECO1 [% by weight] 70 70 70 70 RAHECO sealing layer [% by weight] - 40 40 40 R-PP1 [% by weight] - 16 30 44 R-PP2 [% by weight] - 44 30 16 HECO2 [% by weight] 100 - - - Table 4 Properties of inventive and comparative multilayer films Tensile Modulus (MD) [MPa] 1140 860 970 860 Tensile Modulus (TD) [MPa] 1100 850 1010 950 DDI [g] 173 386 138 226 Opacity [%] 27.6 32.8 28.5 31.2 SIT [°C] 145 122 125 125 Sealing Resistance (bs) [N / 15 mm] 6.0 22.6 25.6 25.5 Sealing Resistance (as) [N / 15 mm] 5.4 27.1 30.3 29.4 Sealing Resistance (as) / Sealing Resistance (bs) [%] 90 120 118 115

[0187] As can be seen in Table 4, the inventive multilayer films significantly reduced the SIT values, as well as dramatically improved the sealing strength, both before and after sterilization, while maintaining acceptable mechanical and optical properties. In addition Petition 870250078585, dated 03 / 09 / 2025, page 52 / 167 42 / 42 of this, the sealing force after sterilization is, in all cases, greater than before sterilization, in contrast to the comparative example, which shows a reduction in sealing force. Petition 870250078585, dated 03 / 09 / 2025, page 53 / 167

Claims

1 / 7 CLAIMS 1. Multilayer film (F) characterized by comprising, in a given order, the following layers: (A) a coating layer, comprising at least 90% by weight, based on the total weight of the coating layer, of a polypropylene or a mixture of polypropylenes; (B) a core layer, comprising at least 90% by weight, based on the total weight of the core layer, of polypropylene or a mixture of polypropylenes;and (C) a sealing layer comprising at least 90% by weight, based on the total weight of the sealing layer, of a polypropylene (PC) composition comprising the following components: i) 20 to 70% by weight, based on the total weight of the polypropylene (PC) composition, of a heterophasic random copolymer of propylene-ethylene (RAHECO), having a melt flow rate (MFR2), determined in accordance with ISO 1133 at 230 °C and 2.16 kg, in the range of 0.1 to 10.0 g / 10 min, comprising: a) a crystalline matrix (M) which is a random copolymer of propylene-ethylene; and b) an amorphous elastomer of propylene-ethylene (E); ii) 10 to 50% by weight, based on the total weight of the polypropylene (PC) composition, of a first random copolymer of propylene-ethylene (R-PP1) having a melt flow rate (MFR2), determined according to ISO 1133 at 230 °C and 2.16 kg, in the range of 1.0 to 6.0 g / 10 min;and iii) 10 to 50% by weight, based on the total weight of the polypropylene (PC) composition, of a second random propylene-ethylene copolymer (R-PP2) having a melt flow rate (MFR2), determined in accordance with ISO 1133 at 230 °C and 2.16 kg, in the range of 7.0 to 20 g / 10 min, wherein the combined amounts of the heterophasic random propylene-ethylene copolymer (RAHECO), the first random propylene-ethylene copolymer (R-PP1) and the second random propylene-ethylene copolymer (R-PP2) are at least 90% by weight, relative to the total weight of the polypropylene (PC) composition; 2. Multilayer film (F), according to claim 1, characterized in that the heterophasic random copolymer of propylene-ethylene (RAHECO) has one or more, preferably all, of the following properties: a) a soluble fraction (SF) content in the range of 10 to 45 wt% and a crystalline fraction (CF) content in the range of 55 to 90 wt%, both determined by CRYSTEX QC analysis; b) a melting temperature (Tm), determined by differential scanning calorimetry (DSC), in the range of 130 to 155 °C; and c) the crystalline matrix (M) being free of 2,1 regiodefects, as determined by 13C-NMR spectroscopy.

3. Multilayer film (F), according to claim 1 or claim 2, characterized in that the heterophasic random copolymer of propylene-ethylene (RAHECO) has one or more, preferably all, of the following properties: a) an ethylene content (C2(total)), determined by CRYSTEX QC analysis, in the range of 3.0 to 15.0% by weight; b) an ethylene content of the soluble fraction (C2(SF)), determined by CRYSTEX QC analysis, in the range of 17.0 to 60.0% by weight; and c) an ethylene content of the crystalline fraction (C2(CF)), determined by CRYSTEX QC analysis, in the range of 1.0 to 8.0% by weight.

4. Multilayer film (F), according to any of the preceding claims, characterized in that the heterophasic random copolymer of propylene-ethylene (RAHECO) has one or more, preferably all, of the following properties: a) an intrinsic viscosity of the soluble fraction (iV(SF)), determined by CRYSTEX QC analysis, in the range of 1.20 to 4.50 dL / g; b) an intrinsic viscosity of the crystalline fraction (iV(CF)), determined by CRYSTEX QC analysis, in the range of 1.20 to 4.50 dL / g; (ec) an intrinsic viscosity ratio (iV(SF) / iV(CF)), determined by CRYSTEX QC analysis, in the range of 0.50 to 2.

00.

5. Multilayer film (F), according to any of the preceding claims, characterized in that the first random copolymer of propylene-ethylene (R-PP1) has one or more, preferably all, of the following properties: a) an ethylene content (C2), determined by quantitative 13C-NMR spectroscopy, in the range of 1.0 to 5.5 wt%; b) a cold soluble xylene content (XCS), determined according to ISO 16152 analysis, in the range of 0.2 to 5.0 wt%; c) a melting temperature (Tm), determined by differential scanning calorimetry (DSC), in the range of 130 to 155 °C; d) a crystallization temperature (Tc), determined by differential scanning calorimetry (DSC), in the range of 110 to 125 °C; (ee) a regiodefect content of 2.1, as determined by 13C NMR spectroscopy, in the range of 0.05 to 1.40 mol%.

6. Multilayer film (F), according to any of the preceding claims, characterized in that the second random copolymer of propylene-ethylene (R-PP2) has one or more, preferably all, of the following properties: a) an ethylene content (C2), determined by quantitative 13C-NMR spectroscopy, in the range of 1.0 to 5.5% by weight; b) a cold soluble xylene content (XCS), determined according to ISO 16152 analysis, in the range of 0.2 to 5.0% by weight; Petition 870250078585, dated 03 / 09 / 2025, page 56 / 167 4 / 7 c) a melting temperature (Tm), determined by differential scanning calorimetry (DSC), in the range of 125 to 145 °C; d) a crystallization temperature (Tc), determined by differential scanning calorimetry (DSC), in the range of 100 to 120 °C; and e) a regiodefect content of 2.1, as determined by 13C NMR spectroscopy, in the range of 0.05 to 1.40 mol%.

7. Multilayer film (F), according to any of the preceding claims, characterized in that: a) the coating layer has a thickness in the range of 10 to 40% of the total thickness of the multilayer film (F); b) the core layer has a thickness in the range of 30 to 70% of the total thickness of the multilayer film (F); and c) the sealing layer has a thickness in the range of 10 to 40% of the total thickness of the multilayer film (F).

8. Multilayer film (F), according to any of the preceding claims, characterized in that at least one of the layers, preferably both, the coating layer and the core layer, comprise at least 90% by weight of a polypropylene (PC') composition comprising the following components: i) 15 to 45% by weight, based on the total weight of the polypropylene (PC') composition, of a heterophasic random copolymer of propylene-ethylene (RAHECO') having a melting temperature (Tm), determined by differential scanning calorimetry (DSC), in the range of 130 to 155 °C, wherein the heterophasic random copolymer of propylene-ethylene (RAHECO') comprises: a1) a crystalline matrix (M) that is a random copolymer of propylene-ethylene, preferably free from 2,1 regiodefects, as determined by quantitative spectroscopy. 870250078585, dated 03 / 09 / 2025, page.57 / 167 5 / 7 NMR; and b1) an amorphous propylene-ethylene elastomer (E), and ii) 55 to 85% by weight, based on the total weight of the polypropylene composition (PC'), of a heterophasic propylene-ethylene copolymer (HECO) having a melting temperature (Tm), determined by differential scanning calorimetry (DSC), in the range of 150 to 170 °C, wherein the heterophasic propylene-ethylene copolymer (HECO) comprises: a2) a crystalline matrix (M) that is a propylene homopolymer, preferably free from 2,1 regiodefects, as determined by quantitative 13C-NMR spectroscopy; and b2) an amorphous propylene-ethylene elastomer (E), wherein the combined amounts of the random heterophasic propylene-ethylene copolymer (RAHECO') and the heterophasic propylene-ethylene copolymer (HECO) are at least 90% by weight, relative to the total weight of the polypropylene composition (PC').

9. Multilayer film (F), according to claim 8, characterized in that the heterophasic random copolymer of propylene-ethylene (RAHECO') has one or more, preferably all, of the following properties: a) a melt flow rate (MFR2), determined according to ISO 1133 at 230 °C and 2.16 kg in the range of 0.1 to 10.0 g / 10 min; b) a soluble fraction (SF) content in the range of 10 to 45% by weight and a crystalline fraction (CF) content in the range of 55 to 90% by weight, both determined by CRYSTEX QC analysis; c) an ethylene content (C2(total)), determined by CRYSTEX QC analysis, in the range of 3.0 to 15.0% by weight; d) an ethylene content of the soluble fraction (C2(SF)), determined by Petition 870250078585, dated 03 / 09 / 2025, page.58 / 167 6 / 7 CRYSTEX QC analysis, in the range of 17.0 to 60.0% by weight; e) an ethylene content of the crystalline fraction (C2(CF)), determined by CRYSTEX QC analysis, in the range of 1.0 to 8.0% by weight; f) an intrinsic viscosity of the soluble fraction (iV(SF)), determined by CRYSTEX QC analysis, in the range of 1.20 to 4.50 dL / g; g) an intrinsic viscosity of the crystalline fraction (iV(CF)), determined by CRYSTEX QC analysis, in the range of 1.20 to 4.50 dL / g; eh) an intrinsic viscosity ratio (iV(SF) / iV(CF)), determined by CRYSTEX QC analysis, in the range of 0.50 to 2.

00.

10. Multilayer film (F), according to claim 8 or claim 9, characterized in that the heterophasic propylene-ethylene copolymer (HECO) has one or more, preferably all, of the following properties: a) a melt flow rate (MFR2), determined according to ISO 1133 at 230 °C and 2.16 kg in the range of 0.1 to 6.0 g / 10 min; b) a soluble fraction (SF) content in the range of 5 to 30% by weight and a crystalline fraction (CF) content in the range of 70 to 95% by weight, both determined by CRYSTEX QC analysis; c) an ethylene content (C2(total)), determined by CRYSTEX QC analysis, in the range of 3.0 to 15.0% by weight; d) an ethylene content of the soluble fraction (C2(SF)), determined by CRYSTEX QC analysis, in the range of 17.0 to 60.0% by weight; and e) an ethylene content of the crystalline fraction (C2(CF)), determined by CRYSTEX QC analysis, in the range of 1.0 to 8.0% by weight;f) an intrinsic viscosity of the soluble fraction (iV(SF)), determined by CRYSTEX QC analysis, in the range of 1.20 to 4.50 dL / g; and g) an intrinsic viscosity of the crystalline fraction (iV(CF)), determined by CRYSTEX QC analysis, in the range of 1.20 to 4.50 dL / g.

11. Multilayer film (F), according to any one of claims 8 to 10, characterized in that the heterophasic random copolymer of propylene-ethylene (RAHECO') is the same as the heterophasic random copolymer of propylene-ethylene (RAHECO).

12. Multilayer film (F), according to any of the preceding claims, characterized by having a thickness in the range of 20 to 150 µm.

13. Multilayer film (F), according to any of the preceding claims, characterized by having one or more, preferably all of the following properties: a) a tensile modulus in the machine direction (TM-MD), measured according to ISO 527-3, in the range of 700 to 1500 MPa; b) a tensile modulus in the transverse direction (TM-TD), measured according to ISO 527-3, in the range of 700 to 1500 MPa; and c) dart drop impact resistance (DDI), measured according to ISO 7765-1, in the range of 100 to 600 g.

14. Multilayer film (F), according to any of the preceding claims, characterized by having an opacity value, determined in accordance with ASTM D1003, in the range of 10 to 40%.

15. Multilayer film (F), according to any of the preceding claims, characterized by having one or more, preferably all, of the following properties: a) a sealing initiation temperature (SIT), determined according to the method specified in the measurement methods, in the range of 115 to 130 °C; b) a sealing force before sterilization (bs), determined according to the method specified in the measurement methods, in the range of 15 to 40 N / mm²; and c) a sealing force after sterilization (as), determined according to the method specified in the measurement methods, in the range of 20 to 45 N / mm². Petition 870250078585, dated 03 / 09 / 2025, page 60 / 167