Polymer compositions suitable for film production

Abstract

The present invention relates to a polymer composition comprising at least the following components: (A) 30.0 to 80.0 wt. %, based on the total weight of the polymer composition, of a single-site catalyzed C2C3 heterophasic copolymer (HECO), whereby the copolymer has a melting point in the range of 150 to 162°C, as determined by differential scanning calorimetry in accordance with ISO 11357-3; a MFR2 (230°C, 2.16 kg), as determined in accordance with ISO 1133 in the range of 5.0 to 40.0 g / 10 min; a total C2 content in the range of 1 to 10 wt. %, based on the total weight of component (A); and a CRYSTEX QC, Polymer, as described herein. A C2C3 heterophasic copolymer produced by a single-site catalyst, having a soluble fraction (SF) based on the total weight of component (A) in the range of 10 to 50 wt%, as determined according to Char; and (B) a propylene homopolymer in the range of 20.0 to 70.0 wt%, as determined according to ISO 1133 in the range of 1.0 to 20.0 g / 10 min; MFR2 (190° C., 2.16 kg), as determined according to ISO 16790 in the range of 1.0 to 20.0 g / 10 min; and F (190° C., 2.16 kg), as determined according to ISO 16790 in the range of 10 cN. 30 and a propylene homopolymer having a melt strength; wherein the weight percentages of components (A) and (B) add up to 100 wt %. Furthermore, the present invention relates to a film comprising the polymer composition according to the present invention, and to a coated article comprising at least one layer comprising said polymer composition.

Description

Technical Field

[0001] The present invention relates to a polymer composition containing a specific C2C3 heterophasic copolymer and a specific propylene homopolymer, and a film and a coated article including a layer containing the polymer composition.

Background Art

[0002] Polypropylene compositions suitable for coating, particularly extrusion coating, are already known in the art.

[0003] Patent Document 1 relates to polyolefin compositions for the extrusion, coating, and molding of various articles, containing from about 40 to 99 wt% of mostly polypropylene of a mixture having a flow rate of about 12 dg / min to 120 dg / min, and from about 1 to 60 wt% of polyethylene having a melt index of about 1 dg / min to 15 dg / min, a density greater than about 0.912 g / cc, and a melt index recovery greater than 50%.

[0004] Patent Document 2 refers to mixtures containing a degraded crystalline polypropylene or a propylene-containing copolymer useful as an extrusion coating composition. These coated substrates can then be used for making bags and other packaging applications. In particular, these coatings are mixtures of a degraded crystalline polypropylene or a propylene-containing copolymer and low-density polyethylene.

[0005] Patent Document 3 relates to an extrusion-coated substrate having a coating containing a polyethylene produced by polymerization catalyzed by a single-site catalyst and containing ethylene and at least two C4-12 alpha olefins as comonomers.

[0006] Patent Document 4 refers to a process of extruding a mixture of an irradiated first propylene polymer and a non-irradiated second propylene polymer, wherein the first propylene polymer contains a non-phenolic stabilizer. The irradiation of the first propylene polymer extrudate is carried out in a low-oxygen environment, and the irradiated first propylene polymer and the non-irradiated second propylene polymer are mixed at a temperature below their respective melting points. The mixture has a viscosity retention rate of 20 to 35%.

[0007] Patent Document 5 relates to a polypropylene composition suitable for extrusion coating or extrusion foaming for a wide variety of substrates having high melt strength and drawability, excellent processability, low gel content, and being able to withstand high temperatures, a process for providing such a polypropylene composition and an extruded coated or extrusion foamed article. The polypropylene composition includes a polypropylene-based resin, whereby the polypropylene-based resin has an optical gel index of 1000 or less and an MFR2 (2.16 kg, 230 °C, ISO 1133) of 5 to 35 g / 10 min measured using an OCS gel counting device on a thin cast film with a film thickness of 70 μm produced at a chill roll temperature of 40 °C, whereby the polypropylene-based resin has a strain hardening coefficient (SHF) of 2.3 to 7.0 when measured at a strain rate of 3.0 s-1 and a Hencky strain of 2.5. A process for producing such a polypropylene composition is characterized in that a polypropylene intermediate-based resin obtained by a single-site catalyst having an MFR2 (2.16 kg, 230 °C, ISO 1133) of 6.0 g / 10 min or less is mixed with a peroxide masterbatch composition and an oligomer diene masterbatch composition to form a pre-mixed material; further, the pre-mixed material is melt-mixed in a melt mixing device at a barrel temperature in the range of 180 to 300 °C.

[0008] Patent Document 6 refers to a process for providing a polypropylene composition including branched polypropylene, in which polypropylene having a melt flow rate MFR2 (230°C) of more than 1.0 g / 10 min is reacted with a thermal decomposition free radical-forming agent and an optionally bifunctional unsaturated monomer to obtain branched polypropylene, which has an F30 melt strength of more than 5.8 cN and a v30 melt extensibility of more than 200 mm / s.

[0009] Film and coating applications require high melt strength, and in addition, many applications require an excellent balance of sealing and optical properties. Furthermore, food applications require a low content of hexane-extractable materials. Compositions known from the prior art do not provide a combination of these properties and / or have a high content of hexane-extractable materials. Generally, compositions that provide low haze and a low sealing onset temperature (SIT) are preferred. [Prior art documents] [Patent Documents]

[0010] [Patent Document 1] US3,418,396 A [Patent Document 2] US4,378,451 A [Patent Document 3] EP1638695 A1 [Patent Document 4] US2014 / 031462 A1 [Patent Document 5] EP2492293 A1 [Patent Document 6] EP2877535 A1 [Patent Document 7] EP0887379 A1 [Patent Document 8] WO92 / 12182 A1 [Patent Document 9] WO2004 / 000899 A1

Patent document 10

Patent document 11

Patent document 12

Patent document 13

Patent document 14

Patent document 15

Patent document 16

Non-licensed literature

[0011]

Non-licensed literature 1

Non-licensed Document 2

Non-licensed Document 4

Non-licensed Document 5

[0012] Therefore, one object of the present invention was to provide a polymer composition that has high melt strength and exhibits an excellent combination of sealing properties, particularly low SIT, and optical properties, particularly low haze. Furthermore, another object of the present invention was to provide a composition that enables the production of films and coated articles with a low content of hexane-extractable substances. [Means for solving the problem]

[0013] These objectives are addressed by the polymer composition described in claim 1, which comprises at least the following components: (A) A C2C3 heterogeneous copolymer (HECO) produced by 30.0 to 80.0 wt% of a single-site catalyst based on the total weight of the polymer composition; thereby, the copolymer is - Melting point in the range of 150 to 162°C, determined by differential scanning calorimetry according to ISO 11357-3; - MFR2 (230°C, 2.16 kg) determined according to ISO 1133, ranging from 5.0 to 40.0 g / 10 min; - Total C2 content ranging from 1 to 10 wt% based on the total weight of component (A); and - Soluble fraction (SF) based on the total weight of component (A) in the range of 10 to 50 wt%, as determined according to CRYSTEX QC, Polymer Char as described herein. A C2C3 heterophase copolymer (HECO) produced by a single-site catalyst, having the following characteristics: (B) Based on the total weight of the polymer composition, 20.0 to 70.0 wt% of propylene homopolymer, thereby the propylene homopolymer is - MFR2 (190℃, 2.16kg) determined according to ISO 1133 in the range of 1.0 to 20.0 g / 10min; and - F determined according to ISO 16790, at least 10 cN 30 Melt strength; A propylene homopolymer having, This includes the sum of the weight ratios of components (A) and (B), which equals 100 wt%.

[0014] Advantageous embodiments of the polymer composition according to the present invention are specified in dependent claims 2 to 7. Claim 8 of the present invention relates to a film comprising at least one layer containing the polymer composition according to the present invention, and claims 8 to 11 relate to preferred embodiments of the film. Claims 12 to 13 relate to a coated article comprising at least one layer containing the polymer composition, claim 14 relates to a process for producing the article, and claim 15 relates to the use of the coating for a particular end use. [Modes for carrying out the invention]

[0015] definition Display of quantity The polymer composition according to the present invention necessarily comprises components (A) and (B), and optionally an additive (C). The requirement here is that the sum of components (A) and (B), and additive (C), if present, is 100 wt%, applies. The fixed range for the indication of the amounts of the individual components (A) and (B), and optionally additive (C), is understood to allow for the selection of any amount within a specific range for each individual component, provided that the strict requirement that the sum of all components (A), (B), and optionally additive (C) is 100 wt%, is met.

[0016] Legioma Regional defects in propylene polymers can be of three distinct types: 2,1-erythro(2,le), 2,1-threo(2,It), and 3,1 defects. A detailed description of the structure and formation mechanism of regiodefects in polypropylene can be found in Non-Patent Literature 1. These defects are described in more detail below. 13 It is measured using 13C NMR.

[0017] As used in the present invention, the term "2,1-regiodefect" defines the sum of 2,1-erythroregiodefects and 2,1-threoregiodefects. A propylene random copolymer or polypropylene homopolymer having the number of regiodefects required in the propylene composition of the present invention is usually and preferably prepared in the presence of a single-site catalyst.

[0018] Catalysts particularly affect the microstructure of polymers. Therefore, polypropylene prepared using single-site metallocene catalysts exhibits a different microstructure compared to that prepared using Ziegler-Natta (Zn) catalysts. The most notable difference is the presence of regiodefects in polypropylene prepared with metallocenes, unlike in polypropylene prepared with Ziegler-Natta (Zn) catalysts.

[0019] A polymer "produced by a single-site catalyst" is a polymer produced in the presence of a single-site catalyst.

[0020] Where the term “including” is used in this specification and in the claims, it does not exclude other unspecified elements having primary or minor functional importance. For the purposes of the present invention, the term “consisting of” is considered a preferred embodiment of the term “including.” Hereinafter, where a group is defined as containing at least a certain number of embodiments, this will also be understood as disclosing a group preferably consisting only of these embodiments.

[0021] Whenever the terms “contains” or “possess” are used, these terms are equivalent to “contains” as defined above.

[0022] For example, when an indefinite or definite article is used to refer to a singular noun, such as "a," "an," or "the," it includes the plural form of that noun unless otherwise specifically stated.

[0023] Ingredient (A) The polymer composition according to the present invention comprises a C2C3 heterophase copolymer (HECO) produced by a single-site catalyst in an amount of 30.0 to 80.0 wt% based on the total weight of the polymer composition, with component (A); the copolymer having a melting point in the range of 150 to 162°C determined by differential scanning calorimetry according to ISO 11357-3; an MFR2 (230°C, 2.16 kg) in the range of 5.0 to 40.0 g / 10 min determined according to ISO 1133; a total C2 content in the range of 1 to 10 wt% based on the total weight of component (A); and a soluble fraction (SF) based on the total weight of component (A) in the range of 10 to 50 wt% determined according to CRYSTEX QC, Polymer Char as described in the Experiments section.

[0024] Preferred embodiments of component (A) are discussed below.

[0025] A preferred embodiment of the present invention specifies that component (A) has a melting point determined by differential scanning calorimetry according to ISO 11357-3, in the range of 151 to 160°C, preferably in the range of 151 to 155°C, and more preferably in the range of 151 to 154°C.

[0026] According to another preferred embodiment of the present invention, component (A) has an MFR2 (230°C, 2.16 kg) determined according to ISO 1133, in the range of 10.0 to 30.0 g / 10 min, preferably in the range of 15.0 to 25.0 g / 10 min, and more preferably in the range of 20.0 to 23.0 g / 10 min.

[0027] Furthermore, a further preferred embodiment of the present invention specifies that component (A) has a total C2 content in the range of 1.0 to 8.0 wt%, preferably in the range of 1.5 to 6 wt%, and more preferably in the range of 2.5 to 4.0 wt%, based on the total weight of component (A).

[0028] In another preferred embodiment of the present invention, component (A) has a soluble fraction (SF) based on the total weight of component (A) in the range of 15 to 40 wt%, preferably in the range of 20 to 30 wt%, and more preferably in the range of 24 to 28 wt%, as determined according to CRYSTEX QC, Polymer Char as described in the Experiments section.

[0029] According to further embodiments of the present invention, component (A) has a C2 content of soluble fraction (SF) based on the total weight of soluble fractions in the range of 5 to 40 wt%, preferably 8 to 30 wt%, more preferably 8 to 25 wt%, and even more preferably 9 to 12 wt%, as determined according to CRYSTEX QC, Polymer Char as described in the Experiments section.

[0030] A further preferred embodiment of the present invention specifies that component (A) has a C2 content of the crystalline fraction (CF) based on the total weight of the crystalline fractions, less than 4 wt%, preferably less than 2 wt%, more preferably in the range of 0 to 1 wt%, and even more preferably 0 wt%, as determined according to the CRYSTEX QC, Polymer Char as described in the Experiments section.

[0031] According to another preferred embodiment of the present invention, component (A) has an intrinsic viscosity (IV) of the soluble fraction (SF) in the range of 1.0 to 5.0 dl / g, preferably 2.0 to 4.0 dl / g, more preferably 2.2 to 3.4 dl / g, and even more preferably 3.0 to 3.3 dl / g, as determined according to CRYSTEX QC, Polymer Char as described in the Experiments section.

[0032] Furthermore, a further preferred embodiment of the present invention specifies that component (A) has an intrinsic viscosity (IV) of the crystalline fraction (CF) in the range of 0.5 to 4.0 dl / g, preferably in the range of 0.8 to 2.0 dl / g, and more preferably in the range of 1.0 to 1.2 dl / g, as determined according to CRYSTEX QC, Polymer Char as described in the Experiments section.

[0033] According to another preferred embodiment of the present invention, component (A) has a Tg1 determined by dynamic mechanical analysis (DMA) according to ISO 6721-7 in the range of -10 to 10°C, preferably in the range of -5 to 5°C, more preferably in the range of -2 to 2°C.

[0034] According to another preferred embodiment of the present invention, component (A) has a Tg2 determined by dynamic mechanical analysis (DMA) according to ISO 6721-7 in the range of -70 to -10°C, preferably in the range of -45 to -20°C, and more preferably in the range of -26 to -22°C.

[0035] Furthermore, a further preferred embodiment according to the present invention stipulates that component (A) has a storage modulus G' determined by dynamic mechanical analysis (DMA) according to ISO 6721-7 in the range from 250 to 600 MPa, preferably in the range from 300 to 550 MPa, more preferably in the range from 420 to 470 MPa.

[0036] The glass transition temperature Tg and the storage modulus G'(23 °C) were determined by dynamic mechanical analysis (DMA) according to ISO 6721-7.

[0037] In another preferred embodiment according to the present invention, component (A) is produced in the presence of a single-site catalyst of a metallocene catalyst.

[0038] Preferred metallocene catalysts have the formula (I) shown below

[0039]

Chemical formula

[0040] According to another preferred embodiment, the metallocene catalyst is the following:

[0041] [ka] It holds.

[0042] Preferably, component (A) is prepared in a stepwise polymerization process comprising at least two polymerization reactors (R1) and (R2), thereby generating a first polymer fraction (a1) in the first polymerization reactor (R1), which is then transferred to the second polymerization reactor (R2). Next, in the second polymerization reactor (R2), a second polymer fraction (a2) is generated in the presence of the first polymer fraction (a1).

[0043] A polymerization process suitable for producing component (A) generally comprises at least two polymerization steps, each of which can be carried out in a solution, slurry, fluidized bed, bulk, or gas phase.

[0044] A preferred multi-step process for producing component (A) is a “loop gas phase” process, such as the one developed by Borealis (known as the BORSTAR® technology), as described in patent documents such as Patent Documents 7, 8, 9, 10, 11, 12, or 13. A further suitable slurry gas phase process is Basell’s Spheripol® process.

[0045] Ingredient (B) The polymer composition according to the present invention comprises, as component (B), 20.0 to 70.0 wt% of propylene homopolymer based on the total weight of the polymer composition, thereby the propylene homopolymer having an MFR2 (190°C, 2.16 kg) determined according to ISO 1133 in the range of 1.0 to 20.0 g / 10 min; and F at least 10 cN determined according to ISO 16790. 30 It contains a propylene homopolymer having the following properties.

[0046] Preferred embodiments of component (B) are discussed below.

[0047] According to one preferred embodiment of the present invention, component (B) has an MFR2 (230°C, 2.16 kg) determined according to ISO 1133 in the range of 1.0 to 15.0 g / 10 min, preferably in the range of 3.0 to 15.0 g / 10 min, more preferably in the range of 6.0 to 14.0 g / 10 min, and even more preferably in the range of 8.0 to 12.0 g / 10 min.

[0048] A further preferred embodiment of the present invention is one in which component (B) is determined according to ISO 16790 to be at least 20 cN, preferably at least 30 cN, and more preferably in the range of 30 to 60 cN. 30 It is stipulated that it must have [something].

[0049] In a further preferred embodiment of the present invention, component (B) is determined according to ISO 16790 in the range of at least 200 mm / s, preferably at least 250 mm / s, and more preferably in the range of 250 to 300 mm / s. 30 It has melt-spreadable properties.

[0050] Furthermore, a further preferred embodiment of the present invention is that component (B) is 895 to 920 kg / m³. 3 range, preferably 900 to 910 kg / m 3 The range is, more preferably, 904 to 906 kg / m 3 It specifies that the density must be determined according to ISO 1183 within the specified range.

[0051] Polymer composition According to one preferred embodiment of the present invention, the polymer composition has an MFR2 (230°C, 2.16 kg) determined according to ISO 1133 in the range of 4.0 to 30.0 g / 10 min, preferably in the range of 8.0 to 20.0 g / 10 min, and more preferably in the range of 12.0 to 16.0 g / 10 min.

[0052] Another preferred embodiment specifies that the polymer composition has an F30 determined according to ISO 16790, ranging from at least 2 cN, preferably at least 3 cN, and more preferably in the range of 3 to 5 cN.

[0053] Furthermore, a further preferred embodiment of the present invention is that the polymer composition is determined according to ISO 16790 in the range of at least 200 mm / s, preferably at least 230 mm / s, more preferably in the range of 240 to 300 mm / s, and even more preferably in the range of 240 to 260 mm / s. 30 It is specified that it must be melt-spreadable.

[0054] According to a further preferred embodiment of the present invention, the polymer composition has an MFR2 (230°C, 2.16 kg) determined according to ISO 1133 in the range of 12.0 to 16.0 g / 10 min, and F determined according to ISO 16790 in the range of 3 to 5 cN. 30 It holds.

[0055] Further embodiments of the present invention specify that the polymer composition has a xylene-soluble (XCS) fraction determined in accordance with ISO 16152, in the range of 10 to 20 wt%, preferably in the range of 12 to 18 wt%, and more preferably in the range of 14 to 16 wt%.

[0056] According to a further preferred embodiment of the present invention, the polymer composition has a flexural modulus determined according to ISO 178, in the range of 1000 to 1600 MPa, preferably in the range of 1100 to 1400 MPa, and more preferably in the range of 1200 to 1300 MPa.

[0057] A further preferred embodiment of the present invention specifies that the polymer composition has an intrinsic viscosity of XCS measured according to DIN ISO 1628 / 1 and / 3, in the range of 2.5 to 3.6 dl / g, preferably in the range of 2.7 to 3.3 dl / g, and more preferably in the range of 3.05 to 3.15 dl / g.

[0058] According to a further preferred embodiment of the present invention, the polymer composition is 4 to 20 kJ / m³ 2 The range is preferably 4.5 to 8 kJ / m 2 The range is more preferably 5 to 6 kJ / m 2 It has a Charpy notch impact strength within the range determined at 23°C according to ISO 179 1eA.

[0059] A further preferred embodiment of the present invention specifies that the polymer composition has a haze in the range of 5 to less than 60%, preferably in the range of 40 to 55%, and more preferably in the range of 45 to 51%, as determined on a test specimen having a thickness of 1 mm as described in the Experiments section.

[0060] According to a further preferred embodiment of the present invention, the polymer composition has a content of hexane-soluble material (C6FDA wt%) determined according to FDA Section 177.1520, less than 2.1 wt%, preferably in the range of 0.5 to 2.0 wt%, more preferably in the range of 0.5 to 1.8 wt%, and even more preferably in the range of 1.2 to 1.6 wt%. Furthermore, the C6FDA / XCS ratio is preferably less than 0.20, and more preferably less than 0.10.

[0061] Another preferred embodiment of the present invention specifies that the polymer composition preferably comprises at least one additive (C) selected from the group comprising slip agents, acid scavengers, UV stabilizers, pigments, antioxidants, additive carriers, nucleating agents, and mixtures thereof, thereby ensuring that these additives are present in preferably 0.1 to 5.0 wt%, more preferably 0.1 to 4.0 wt%, based on the total weight of the polymer composition.

[0062] film The present invention also relates to a film comprising a polymer composition according to the present invention, and according to one preferred embodiment, the film comprises the polymer composition.

[0063] A further preferred embodiment of the present invention specifies that the film has a tensile modulus determined according to ISO 527-3 at 23°C on a cast film having a thickness of 50 μm in the longitudinal and transverse directions, in the range of 200 to 1000 MPa, preferably in the range of 300 to 700 MPa, and more preferably in the range of 400 to 500 MPa.

[0064] According to another preferred embodiment of the present invention, the film has a sealing start temperature determined as described in the Experiments section on a cast film having a thickness of 50 μm, in the range of 100°C to less than 140°C, preferably in the range of 120°C to 135°C, more preferably in the range of 120°C to 132°C, and even more preferably in the range of 128 to 130°C.

[0065] In a further preferred embodiment of the present invention, the film has haze determined according to ASTM D1003-00 on a cast film having a thickness of 50 μm, in the range of 5 to less than 20%, preferably in the range of 8 to 16%, and more preferably in the range of 10 to 15%.

[0066] All of the above preferred embodiments and models for the composition also apply to the film according to the present invention.

[0067] Coated articles The present invention also relates to a coated article comprising at least one layer comprising the polymer composition according to the present invention, preferably the layer comprising the polymer composition.

[0068] According to one preferred embodiment of the present invention, the coated article is an extruded coated article. The article may be produced by each process that includes an extruded coating step.

[0069] The extrusion coating process can be carried out using conventional extrusion coating techniques. Accordingly, the composition according to the present invention can be supplied to the extruder, typically in the form of pellets. From the extruder, the polymer molten material is preferably passed through a flat die to the substrate to be coated. The coated substrate is cooled on a chill roll and then passed to an edge trimmer and wound up.

[0070] The die width typically depends on the size of the extruder used. Therefore, for a 90mm extruder, the width may be appropriately in the range of 600 to 1,200mm; for a 115mm extruder, in the range of 900 to 2,500mm; for a 150mm extruder, in the range of 1,000 to 4,000mm; and for a 200mm extruder, in the range of 3,000 to 5,000mm. The line speed (drawdown speed) is preferably 75 m / min or higher, more preferably at least 100 m / min. In most commercially operating machines, the line speed is preferably above 300 m / min or above 500 m / min. Recent machines are designed to operate at line speeds up to 1,000 m / min, for example, from 300 to 800 m / min.

[0071] The temperature of the polymer melt is typically 240 to 330°C. The polypropylene composition of the present invention can be extruded onto a substrate as a single-layer coating or as one or more layers, preferably as an outer layer, in a co-extrusion process. In a multilayer extruded coating, the above-mentioned polymer layer structure and optionally other polymer layers may be co-extruded. If desired or necessary, further ozone and / or corona treatment can be performed by known methods.

[0072] All of the above preferred embodiments and models for the composition also apply to coated articles according to the present invention.

[0073] use The present invention also relates to the use of polymer compositions, films, or coated articles according to the present invention as packaging materials, preferably as heat-resistant packaging materials for food and / or medical products.

[0074] Next, the present invention will be described with reference to the following non-limiting examples.

[0075] Experimental section A.Measurement method The following definitions of terms and measurement methods apply to the general description of the present invention above and to the following examples, unless otherwise specified.

[0076] Meltflow rate The melt flow rate (MFR) is determined according to ISO 1133 - Determination of melt mass flow rate (MFR) and melt volume flow rate (MVR) of thermoplastics - Part 1: Standard methods, and is expressed in g / 10min. MFR is an indicator of the fluidity, and therefore processability, of the polymer. The higher the melt flow rate, the lower the viscosity of the polymer. The MFR² of polypropylene is determined at a temperature of 230°C and a load of 2.16 kg.

[0077] Quantification of fine structure by NMR spectroscopy (comonomer content and regiodefects) Quantitative nuclear magnetic resonance (NMR) spectroscopy was further used to quantify the comonomer content and comonomer arrangement distribution of the polymer. 13 C{ 1 The H}NMR spectrum, 1 H and 13 The spectra were recorded in solution using a Bruker Advance III 400 NMR spectrometer operating at 400.15 and 100.62 MHz for C, respectively. All spectra were recorded at 125°C using nitrogen gas for all air pressures. 13Recording was performed using a 10 mm extended temperature probe head optimized for C. Approximately 200 mg of the material was dissolved in 3 ml of 1,2-tetrachloroethane-d2 (TCE-d2) together with chromium-(III)-acetylacetonate (Cr(acac)3), resulting in a 65 mM solution of the relaxant in solvent (Singh, G., Kothari, A., Gupta, V., Polymer Testing 28 5 (2009), 475). To ensure a homogeneous solution, after initial sample preparation on a heat block, the NMR tube was further heated in a rotating oven for at least 1 hour. After insertion into the magnet, the tube was rotated at 10 Hz. This setup was chosen primarily for high resolution and was quantitatively necessary for accurate ethylene content quantification. Standard single-pulse excitation was utilized without NOE using an optimized tip angle, 1 s recycle delay, and a bilevel Waltz 16 decoupling scheme (Non-Patent Literature 2; Non-Patent Literature 3). A total of 6144 (6k) transient responses were obtained per spectrum.

[0078] quantitative 13 C{ 1 The 1H NMR spectra were processed and integrated, and relevant quantitative properties were determined from the integration using a proprietary computer program. All chemical shifts were indirectly related to the central methylene group of the ethylene block (EEE) at 30.00 ppm using the chemical shift of the solvent. This approach allowed for a comparable standard even in the absence of this structural unit. Characteristic signals corresponding to ethylene incorporation were observed (Non-Patent Literature 4).

[0079] As described in Non-Patent Documents 5, 4, and 6, characteristic signals corresponding to 2,1-erythroregio defects were observed, and correction for the influence of regio defects on the determined characteristics was necessary. No characteristic signals corresponding to other types of regio defects were observed.

[0080] 13 C{ 1The comonomer fraction was quantified using the method of Wang et al. (Non-Patent Literature 6) via the integration of multiple signals across the entire spectral region in the H} spectrum. This method was chosen for its robustness and, where necessary, its ability to account for the presence of regiodefects. The integration region was slightly adjusted to enhance its applicability across the entire range of comonomer content encountered.

[0081] In systems where only isolated ethylene in the PPEPP sequence was observed, the method of Wang et al. was modified to reduce the effect of non-zero integrals from sites known to be absent. This approach reduces the overestimation of ethylene content for such systems and the number of sites used to determine the absolute ethylene content is as follows: E=0.5(Sββ+Sβγ+Sβδ+0.5(Sαβ+Sαγ)) This was achieved by reducing it.

[0082] Through the use of this set of parts, the corresponding integral equation becomes: E=0.5(I H +I G +0.5(I C +I D )) The same symbols used in Wang et al.'s literature (Non-Patent Document 6) are used. The formula used for absolute propylene content has not been modified.

[0083] Mole percent comonomer incorporation is as follows: E[mol%]=100*fE It was calculated from the mole fraction.

[0084] The weight percentage of comonomer incorporation was calculated from the mole fraction: E[wt%]=100*(fE*28.06) / ((fE*28.06)+((1-fE)*42.08)).

[0085] The comonomer sequence distribution at the triple structure level was determined using the analytical method of Kakugo et al. (Non-Patent Literature 7). This method was chosen for its robust properties and for a slightly modified integration region to enhance its applicability to a wider range of comonomer content.

[0086] Xylene-soluble substance (XCS, wt%) The xylene-soluble (XCS) fraction defined and described in this invention was determined in accordance with ISO 16152 as follows: 2.0 g of polymer was dissolved in 250 ml of p-xylene at 135°C under stirring. After 30 minutes, the solution was allowed to cool to ambient temperature for 15 minutes, and then allowed to precipitate at 25+ / -0.5°C for 30 minutes. The solution was filtered using filter paper and placed into two 100 ml flasks. The solution from the first 100 ml container was evaporated in a nitrogen stream, and the residue was dried under vacuum at 90°C until a certain weight was reached. The xylene-soluble fraction (percent) was then determined as follows: XCS%=(100*m*V0) / (m0*v) m0 = initial amount of polymer (g); m = weight of residue (g); V0 = initial volume (ml); v = Volume of the analyzed sample (ml) It is possible to make a decision.

[0087] DSC analysis, melting temperature (Tm), and crystallization temperature (Tc) Data were measured using differential scanning calorimetry (DSC) with a TA Instrument Q2000 in samples ranging from 5 to 7 mg. DSC was performed in a heat / cool / heat cycle at a scanning rate of 10°C / min in a temperature range of -30 to +225°C, according to ISO 11357 / Part 3 / Method C2.

[0088] Crystallization temperature (T c ) and crystallization enthalpy (H c The melting temperature (Tm) and enthalpy of melt (H) are determined from the cooling step. m This was determined from the second heating step.

[0089] Sealing start temperature (SIT) This method determines the sealing temperature range (sealing range) of a polypropylene film, particularly a blown film or a cast film. The sealing temperature range is the temperature range in which the film can be sealed according to the conditions described below. The lower limit (sealing start temperature (SIT)) is the sealing temperature at which a sealing strength of 5+ / -0.5N is achieved. The upper limit (sealing end temperature (SET)) is reached when the film adheres to the sealing device. The sealing range is for a 50 μm thick film produced in a three-layer cast film co-extrusion line as described below, using a J&B Universal Sealing Machine Type 3000, with the following further parameters: Sample width: 25 mm Seal pressure: 0.67 N / mm² Seal time: 1 sec Cooling time: 30sec Peeling speed: 42 mm / sec Starting temperature: 80℃ End temperature: 150℃ Increment: 5℃ It was determined using [this method].

[0090] The sample is sealed from A to A at each sealing bar temperature, and the seal strength (force) is determined at each step. The temperature at which the seal strength reaches 5 ± 0.5 N is determined.

[0091] Tensile coefficient (TM) The tensile moduli in the longitudinal (MD) and transverse (TD) directions were determined at 23°C according to ISO 527-3 in a 50 μm cast film prepared as described below. The tests were performed at a crosshead speed of 1 mm / min for the linear modulus range and 10 mm / min for higher deformations.

[0092] Haze Haze was determined according to ASTM D1003-00 in cast films with a thickness of 50 μm, as described below, reported as haze (film), or in 1 mm injection-molded samples, as reported as haze (1 mm). 60 × 60 × 1 mm 3 The samples were prepared according to EN ISO 1873-2.

[0093] F 30 Melt strength and v 30 Melt-spreadable The tests described herein conform to ISO 16790:2005. Strain hardening behavior was determined by the method described in Non-Patent Literature 8. The strain hardening behavior of polymers was analyzed using a Rheotens apparatus (product of Gottfert, Siemensstr.2, 74711 Buchen, Germany) in which melt strands are stretched by stretching with a specified acceleration. The Rheotens experiment simulates industrial spinning and extrusion processes. In principle, a molten material is pressed or extruded through a round die, and the resulting strands are stretched. The stress on the extruded material is recorded as a function of melting properties and measurement parameters (particularly the ratio of output to take-up rate, essentially a measure of elongation). For the results shown below, materials were extruded using a HAAKE Polylab system laboratory extruder and a gear pump with a cylindrical die (L / D=6.0 / 2.0mm). The gear pump was pre-set to a strand extrusion speed of 5 mm / s, and the melting temperature was set to 200°C. The spinline length between the die and the Rheotens wheel was 80 mm. At the start of the experiment, the winding speed of the Rheotens wheel was adjusted to the speed of the extruded polymer strand (zero tensile force). Next, the experiment was started by slowly increasing the winding speed of the Rheotens wheel until the polymer filament broke. Since the wheel acceleration was sufficiently small, the tensile force was measured under quasi-steady conditions. The acceleration of the melted strand drawdown was 120 mm / sec. 2Rheotens was operated in combination with the PC program EXTENS. This is a real-time data acquisition program that displays and saves measured data of tensile force and drawdown speed. The endpoint of the Rheotens curve (force vs. pulley rotation speed) is F 30 This is obtained as melt strength and tensile strength.

[0094] Crystalline fraction, soluble fraction, comonomer content, and intrinsic viscosity The crystalline (CF) and soluble (SF) fractions of polypropylene (PP) compositions, as well as the comonomer content and intrinsic viscosity (IV) of each fraction, were analyzed using CRYSTEX QC, Polymer Char (Valencia, Spain). The crystalline and amorphous fractions were separated by temperature cycling of dissolution at 160°C, crystallization at 40°C, and redissolution in 1,2,4-trichlorobenzene (1,2,4-TCB) at 160°C. Quantification of SF and CF, and determination of ethylene content (C2), were achieved using an infrared detector (IR4), and an online two-capillary viscometer was used to determine the intrinsic viscosity (IV). The IR4 detector is a multi-wavelength detector that detects IR absorbance in two different bands (CH3 and CH2) for determining the concentration and ethylene content in the ethylene-propylene copolymer. 13A series of 8EP copolymers with known ethylene content ranging from 2 wt% to 69 wt% (determined by 13C-NMR spectroscopy) were calibrated using various concentrations from 2 to 13 mg / ml for each EP copolymer used for calibration. The amounts of the soluble fraction (SF) and crystalline fraction (CF) were correlated with the amount of "cold xylene soluble" (XCS) and the respective cold xylene insoluble (XCI) fractions, determined by the standard gravimetric method according to ISO 16152, via XS calibration. XCS calibration was achieved by testing various EP copolymers with XS content ranging from 2 to 31 wt%. The intrinsic viscosity (IV) of the parent EP copolymer, as well as its soluble and crystalline fractions, were determined using an online 2-capillary viscometer and correlated with the corresponding IV' determined by the standard method in decalin according to ISO 1628. Calibration was achieved using various EP PP copolymers with IV = 2 to 4 dL / g. Samples of the PP composition to be analyzed were calibrated at concentrations ranging from 10 mg / ml to 20 mg / ml. After automatically filling vials with 1,2,4-TCB containing 250 mg / l of 2,6-tert-butyl-4-methylphenol (BHT) as an antioxidant, the samples were dissolved at 160°C with constant stirring at 800 rpm, typically for 60 minutes, until complete dissolution was achieved. A specified volume of the sample solution was injected into a column filled with an inert support for crystallization and separation of the soluble fraction from the crystalline portion. This process was repeated twice. During the first injection, the entire sample was measured at high temperature to determine the IV [dl / g] and C2 [wt%] of the PP composition. During the second injection, the crystalline fraction (at high temperature) and the soluble fraction (at low temperature) were measured using a crystallization cycle (wt% C2, wt% SF, IV). EP stands for ethylene propylene copolymer. PP stands for polypropylene.

[0095] Hexane-soluble substance (C6FDA, wt%) FDA Section 177.1520 In the experimental section, 1 g of a 50 μm thick polymer film was added to 400 ml of hexane at 50°C for 2 hours while stirring using a Reflux condenser. After 2 hours, the mixture was immediately filtered through N41 filter paper. The precipitate was collected in an aluminum receiver, and the residual hexane was evaporated on a steam bath under a flow of N2.

[0096] The amount of hexane-soluble material is given by the following formula: ((wt. sample + wt. crucible) - (wt. crucible)) / (wt. sample) · 100 It was decided by [the organization / group].

[0097] Glass transition temperature (Tg) and storage modulus (G') The glass transition temperature (Tg) and storage modulus (G') (23°C) were determined by dynamic mechanical analysis (DMA) according to ISO 6721-7. Measurements were performed in torsion mode on compression-molded samples (40 × 10 × 1.0 mm³) heated from -100°C to +150°C at a heating rate of 2°C / min and a frequency of 1 Hz.

[0098] intrinsic viscosity The intrinsic viscosity was measured (at decalin at 135°C) according to DIN ISO 1628 / 1 and / 3, October 1999. The intrinsic viscosity (IV) value increases with the molecular weight of the polymer.

[0099] Flexural modulus The flexural modulus is determined according to ISO 178. The test specimen is 80 × 10 × 4.0 mm. 3 It has dimensions of (length × width × thickness) and is prepared by injection molding according to EN ISO 1873-2. The span length between supports is 64 mm and the test speed is 2 mm / min.

[0100] Charpy-notch impact strength Charpy notch impact strength is measured for an 80 x 10 x 4 mm injection-molded model in accordance with EN ISO 1873-2. 3 The test bar was used to determine the result at 23°C according to ISO 179 1eA.

[0101] B. Materials to be used AO is Irganox® B215, a commercially available product from BASF (a synergistic treatment and long-term thermal stabilization system, a mixture of Irgafos® 168 and Irganox® 1010).

[0102] CaSt is calcium stearate, and is sold by Barlocher under the brand name CEASIT AV FI.

[0103] Reactive modification of LCB PP (component B) The base polymer used was a polypropylene homopolymer with an MFR of 0.23 g / 10 min, produced by Borealis in Advant ZN180M using a single-loop reactor. The final MFR was prepared by using H2 by applying a method well known to those skilled in the art. The typical polymerization settings used were as follows: reactor temperature 70°C, 125 ppm H2, Teal / C3 180 g / t C3, Teal / donor 6 / 1 wt% / wt%.

[0104] The reactive modification of the polymer powder was carried out according to the process described in Patent Document 14. Both butadiene (BD) and peroxide (POX) were pre-mixed with the polymer powder in a horizontal mixer using a paddle stirrer at a temperature of 65°C prior to the melt-mixing step, maintaining an average residence time of 15 minutes. The pre-mixed material was transferred to a Theyson TSK60 co-rotating twin-screw extruder with a 60 mm barrel diameter and an L / D ratio of 48, equipped with a high-strength mixing screw having three kneading zones and a two-stage degassing device, under an inert atmosphere. All temperatures were defined as barrel temperatures, and a melt temperature profile was selected with a starting temperature T1 = 240°C in the feed zone, a maximum temperature T2 = 280°C in the last kneading zone, and a final temperature T3 = 230°C in the die zone. The screw speed was set to 350 rpm. The recipe consisted of 0.45 wt% TRIGONOX BPIC-C75, 0.1 wt% BD, 0.13 wt% AO, and 0.1 wt% CaSt. The density of LCB PP was determined according to ISO 1183 = 905 kg / m³. 3 The melt flow rate (230℃ / 2.16kg) determined according to ISO 1133 = 10g / 10min, F30 = 31.2cN and v determined according to ISO 16790. 30 It has a speed of 266 mm / s.

[0105] Polypropylene (PP HECO1, heterogeneous propylene random copolymer) was prepared as follows.

[0106] Catalyst system for PP HECO1 Catalyst complex In IE2, the following metallocene complex described in Patent Document 15 is used.

[0107] Preparation of MAO-silica support Nitrogen 10 was supplied to a steel reactor equipped with a mechanical stirrer and filter net, and the reactor temperature was set to 20°C. Next, silica grade DM-L-303 (5.0 kg) from AGC Si-Tech Co., pre-calcined at 600°C, was added from the feed drum, and then the reactor was carefully pressurized and depressurized with nitrogen using a manual valve. Next, toluene (22 kg) was added. The mixture was stirred for 15 minutes. Next, MAO solution in 30 wt% toluene (9.0 kg) from Lanxess was added to the top of the reactor via the feed line within 70 minutes. Next, the reaction mixture was heated to 90°C and stirred at that temperature for a further 2 hours. The slurry was allowed to precipitate, and the mother liquor was filtered. The catalyst was washed twice with toluene (22 kg) at 90°C, followed by precipitation and filtration. The reactor was cooled to 60°C, and the solid was washed with heptane (22.2 kg). Finally, the SiO2 treated with MAO was dried at 60°C for 2 hours under a nitrogen stream, and then dried under vacuum (-0.5 barg) for 5 hours with stirring. The MAO-treated support was collected as a fluid white powder found to contain 12.2 wt% Al.

[0108] Preparation of a single-site catalyst system MAO in 30 wt% toluene (0.7 kg) was added to a steel nitrogen-blanked reactor via a burette at 20°C. Next, toluene (5.4 kg) was added with stirring. The above metallocene complex (93 g) was added from a metal cylinder, followed by the flow of 1 kg of toluene. The mixture was stirred at 20°C for 60 minutes. Next, trityltetrakis(pentafluorophenyl) borate (91 g) was added from a metal cylinder, followed by the flow of 1 kg of toluene. The mixture was stirred at room temperature for 1 hour. The resulting solution was added over 1 hour to the stirred cake of MAO-silica support prepared as described above. The cake was allowed to stand for 12 hours, then dried at 60°C for 2 hours under a nitrogen stream, and further dried under vacuum (-0.5 barg) for 5 hours with stirring.

[0109] Polymerization for preparing the PP HECO1 polymer of the present invention was carried out at the Borstar pilot plant using the above-described catalyst system and a three-reactor setup (loop gas-phase reactor (GPR1) - gas-phase reactor (GPR2) and pre-polymerizer).

[0110] Table 1 shows the polymerization conditions and final resin properties for PP HECO1.

[0111] [Table 1] Polypropylene (PP HECO2, heterogeneous propylene random copolymer) was prepared as described in Patent Document 16. PP HECO2 is CE2 as described in Patent Document 16 (see page 36 for the catalyst (Ziegler-Natta catalyst) and Table 4 on page 39 for the polymerization conditions). The polymer powders (PP HECO1 and PP HECO2) were mixed in a Coperion ZSK 57 co-rotating twin-screw extruder at 220°C using the recipe shown in Table 2.

[0112] C. Film Manufacturing Cast films according to Example (IE1) and Comparative Examples (CE1 and CE2) of the present invention were produced on a Collin30 cast film line at a melting temperature of 240°C and a chill roll temperature of 20°C. All obtained films had an overall thickness of 50 μm.

[0113] D. Results and Discussion

[0114] [Table 2] As can be seen from Table 2, the polymer composition according to Example IE1 of the present invention, produced by using a single-site catalyst, is F 30 Melt strength and v 30The long-chain branching (LCB) is clearly demonstrated by melt extensibility. Another advantage obtained by adding component (B) in the example of the present invention is the stiffness of the polymer composition (1272 MPa vs. 730 MPa), which is significantly increased with only a slight loss of toughness (5.3 kJ / m). 2 Vs. 5.8 kJ / m³ 2 However, the polymer composition using CE1 shows a decrease in toughness of approximately 80% (7.1 kJ / m²) upon addition of component (B). 2 Against 33 kJ / m³ 2 (See CE2 in Patent Document 16 above). The polymer composition by IE also has higher purity and much less extract. This is also reflected in the ratio of total extract (C6FDA) and C6FDA to XCS. In addition, films made from the polymer composition according to the present invention exhibit very low haze, a very good sealing onset temperature, and an excellent balance between melt strength and haze.

Claims

1. A polymer composition, wherein the polymer composition comprises at least the following components: (A) C produced by 30.0 to 80.0 wt% of metallocene based on the total weight of the polymer composition. ２ C ３ It is a heterophase copolymer, and thereby the copolymer is - Melting point in the range of 150 to 162°C, determined by differential scanning calorimetry in accordance with ISO 11357-3. - MFR determined according to ISO 1133, in the range of 5.0 to 40.0 g / 10 min ２ (230℃, 2.16kg), - Total C2 content in the range of 1.0 to 10.0 wt% based on the total weight of component (A), and - Soluble fraction separated from the crystalline fraction based on the total weight of component (A) in the range of 10.0 to 50.0 wt%, as determined by an apparatus for analyzing the soluble fraction and crystalline fraction. C produced by metallocene, having the properties of ２ C ３ Heterophase copolymers and (B) Based on the total weight of the polymer composition, 20.0 to 70.0 wt% of propylene homopolymer, thereby the propylene homopolymer is - MFR determined according to ISO 1133, in the range of 1.0 to 20.0 g / 10 min ２ (230°C, 2.16 kg), and - F determined according to ISO 16790, at least 10 cN ３０ Melt strength, A propylene homopolymer having, (C) Optionally, additives and A polymer composition comprising, wherein the total weight ratio of components (A) and (B), and additive (C) if present, is 100 wt%.

2. Component (A) has a melting point determined by differential scanning calorimetry according to ISO 11357-3, in the range of 151 to 160°C, 151 to 155°C, or 151 to 154°C, and / or Component (A) is determined according to ISO 1133, in the range of 10.0 to 30.0 g / 10 min, 15.0 to 25.0 g / 10 min, or 20.0 to 23.0 g / 10 min. ２ (230°C, 2.16 kg) and / or Component (A) has a total C2 content in the range of 1.0 to 8.0 wt%, 1.5 to 6.0 wt%, or 2.5 to 4.0 wt%, based on the total weight of component (A), and / or Component (A) has a soluble fraction separated from the crystalline fraction based on the total weight of component (A) in the range of 15.0 to 40.0 wt%, 20.0 to 30.0 wt%, or 24.0 to 28.0 wt%, as determined by an apparatus for analyzing the soluble fraction and the crystalline fraction. The polymer composition according to claim 1, characterized in that...

3. Component (A) has a C2 content of the soluble fraction based on the total weight of the soluble fraction in the range of 5 to 40 wt%, 8 to 30 wt%, 8 to 25 wt%, or 9 to 12 wt%, as determined by an apparatus for analyzing the soluble fraction and crystalline fraction, and / or Component (A) has a C2 content in the crystalline fraction based on the total weight of the crystalline fraction, which is less than 4 wt%, less than 2 wt%, in the range of 0 to 1 wt%, or 0 wt%, as determined by an apparatus for analyzing the soluble fraction and the crystalline fraction, and / or Component (A) has an intrinsic viscosity of the soluble fraction in the range of 1.0 to 5.0 dl / g, 2.0 to 4.0 dl / g, 2.2 to 3.4 dl / g, or 3.0 to 3.3 dl / g, as determined by an apparatus for analyzing the soluble fraction and the crystalline fraction, and / or Component (A) has an intrinsic viscosity of the crystalline fraction in the range of 0.5 to 4.0 dl / g, 0.8 to 2.0 dl / g, or 1.0 to 1.2 dl / g, as determined by an apparatus for analyzing the soluble fraction and the crystalline fraction. A polymer composition according to claim 1 or 2, characterized in that...

4. Component (B) has an MFR determined in accordance with ISO 1133 in the range of 1.0 to 15.0 g / 10 min, in the range of 3.0 to 15.0 g / 10 min, in the range of 6.0 to 14.0 g / 10 min, or in the range of 8.0 to 12.0 g / 10 min ２ (230 °C, 2.16 kg), and / or Component (B) is F, determined according to ISO 16790, with a minimum of 20 cN, at least 30 cN, or in the range of 30 to 60 cN. ３０ It has melt strength, and / or Component (B) is determined according to ISO 16790, with a range of at least 200 mm / s, at least 250 mm / s, or in the range of 250 to 300 mm / s. ３０ It is melt-spreadable and / or Component (B) is 895 to 920 kg / m³ ３ The range is 900 to 910 kg / m ３ The range, or 904 to 906 kg / m ３ Having a density determined according to ISO 1183 within the range, A polymer composition according to any one of claims 1 to 3, characterized in that...

5. The polymer composition has an MFR determined according to ISO 1133 in the range of 4.0 to 30.0 g / 10 min, 8.0 to 20.0 g / 10 min, or 12.0 to 16.0 g / 10 min. ２ (230°C, 2.16 kg) and / or The polymer composition contains at least 2 cN, at least 3 cN, or F in the range of 3 to 5 cN as determined according to ISO 16790. ３０ It has melt strength, and / or The polymer composition is determined according to ISO 16790, with a range of at least 200 mm / s, at least 230 mm / s, in the range of 240 to 300 mm / s, or in the range of 240 to 260 mm / s. ３０ It is melt-spreadable and / or The polymer composition has an MFR in the range of 12.0 to 16.0 g / 10 min, as determined according to ISO 1133. ２ (230°C, 2.16 kg), and F determined according to ISO 16790 in the range of 3 to 5 cN. ３０ Having melt strength, A polymer composition according to any one of claims 1 to 4, characterized in that

6. The polymer composition according to any one of claims 1 to 5, wherein the polymer composition comprises at least one additive (C) selected from the group consisting of slip agents, acid scavengers, UV stabilizers, pigments, antioxidants, additive carriers, nucleating agents, and mixtures thereof, wherein these additives are present in an amount of 0.1 to 5.0 wt% or 0.1 to 4.0 wt% based on the total weight of the polymer composition.

7. A film comprising the polymer composition described in any one of claims 1 to 6, or comprising the polymer composition.

8. The film according to claim 7, characterized in that the film has a tensile modulus determined at 23°C according to ISO 527-3 on a cast film having a thickness of 50 μm in the longitudinal and transverse directions, in the range of 200 to 1000 MPa, in the range of 300 to 700 MPa, or in the range of 400 to 500 MPa.

9. The film according to claim 7 or 8, characterized in that the film has a sealing start temperature determined on a cast film having a thickness of 50 μm, in the range of 100°C to less than 140°C, in the range of 120°C to 135°C, in the range of 120°C to 132°C, or in the range of 128°C to 130°C.

10. The film according to any one of claims 7 to 9, characterized in that the film has haze determined according to ASTM D1003-00 on a cast film having a thickness of 50 μm, in the range of 5 to less than 20%, in the range of 8 to 16%, or in the range of 10 to 15%.

11. A coated article comprising at least one layer containing the polymer composition according to any one of claims 1 to 6, or at least one layer consisting of the polymer composition.

12. A process for producing a coated article according to claim 11, comprising an extrusion coating step.

13. Use of the coated article according to claim 11 as a packaging material, or as a heat-resistant packaging material for food and / or medical products.

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