Polyolefin composition comprising polypropylene homopolymer and recycled plastic material

Abstract

The present invention provides a polyolefin composition comprising: a) at least one polypropylene homopolymer; b) a blend (A) of recycled plastic materials recovered from waste plastic materials derived from post-consumer waste and / or industrial waste, the blend containing polypropylene and polyethylene in a ratio of 3:7 to 10:1; c) glass fibers; and d) at least one coupling agent, the polyolefin composition having a melt flow rate MFR2 (230°C, 2.16 kg, measured according to ISO 1133) of at least 2 g / 10 min, a tensile modulus (ISO 527-2) of at least 4 GPa, and a tensile modulus (ISO 527-2) of at least 6 kJ / m 2 The present invention relates to a polyolefin composition characterized by an impact strength (ISO179-1, Charpy 1eA +23°C) of 1.0 or more.

Description

[Technical Field]

[0001] The present invention relates to polyolefin compositions comprising at least one polypropylene homopolymer and recycled plastic materials, as well as to articles comprising said polyolefin compositions and methods for preparing such polyolefin compositions. [Background technology]

[0002] Polyolefins, particularly polyethylene and polypropylene, are increasingly being consumed in large quantities in a wide range of applications, including packaging for food and other commodities, textiles, automotive parts, and a wide variety of manufactured goods. Polyethylene-based materials are particularly problematic due to their widespread use in packaging. Considering the large amount of waste recovered compared to the amount recycled and returned to the stream, significant potential remains for intelligent reuse of plastic waste streams and mechanical recycling of plastic waste.

[0003] Typically, recycled polypropylene volumes on the market are a mixture of both polypropylene (PP) and polyethylene (PE), which is especially true for post-consumer waste streams. Furthermore, commercial recyclates from post-consumer waste sources are traditionally cross-contaminated with non-polyolefin materials, such as polyethylene terephthalate, polyamide, and polystyrene, or non-polymeric materials, such as wood, paper, glass, or aluminum. These cross-contaminations dramatically limit the end-use of the recyclate stream, leaving no useful end-uses. In particular, polyolefin recyclates from post-consumer waste streams are a mixture of PE and PP. The better the quality of the recyclate, the less readily available it is and the higher its price.

[0004] Customers seeking recycled products demand stiffness-impact strength similar to virgin products. This is also true for reinforced glass fiber compounds for structural products. The quality issues of recycled products compared to virgin products can be overcome to some extent by reinforcing the recycled product, where the reinforcing particles physically bond the different domains (PP and PE).

[0005] Compositions containing virgin polymers (ie, polymers used for the first time) and recycled mixed plastics are being investigated.

[0006] WO2014 / 167493A1 describes a method for preparing a polyolefin blend comprising step (a) of mixing together a base polymer blend MB and a polymer blend MPR, wherein said blend MPR is obtained from recycled post-consumer plastic materials.

[0007] Glass fiber (GF)-reinforced recycled mixed plastics are also being investigated. For example, recycled PP or PP / PE blends are reinforced with GF or hybrid GF with other fillers.

[0008] EP2845876B1 describes a composition containing two or more types of resin and glass fiber, which comprises a resin mixture containing waste polyethylene (PE) and waste polypropylene (PP); long glass fiber having a length of 10 mm or more; and a rubber-based resin, and the composition contains 3 to 30 parts by weight of the long glass fiber, 10 to 50 parts by weight of the rubber-based resin, and 10 to 35 parts by weight of LDPE per 100 parts by weight of the resin mixture.

[0009] EP3406662A1 describes a structurally reinforced plastic composite product made from recycled waste glass fibers and recycled polymer compounds, and a method for making the same. The reinforced composite article contains recycled fiberglass recovered from waste streams and functioning as a filler, the recycled fiberglass comprising 30-70% of the total weight of the reinforced composite article, a colorant comprising 1-2% of the total weight of the reinforced composite article, and a recycled resin recovered from waste streams, the recycled glass fibers being substantially wetted with a black colorant and a chemical binder. The recycled resin includes at least one of high-density polyethylene (HDPE), polypropylene (PP), or an engineering-grade resin.

[0010] Bajracharya et al. ("Experimental and Theoretical Study on the Properties of Injection-Molded Glass Fiber-Reinforced Mixed Plastic Composites," Composites Part A: Applied Science and Manufacturing, 2016, 84:393-405) and Bajracharya et al. ("Durability Characteristics and Property Prediction of Glass Fiber-Reinforced Mixed Plastic Composites," Composites Part B: Engineering, 2017, 116:16-29) used flake-form PE / PP recycled composites from Repeat Plastics (Replas) Pty., Australia, recovered from post-consumer and post-industrial plastic waste. The recycled composites had a tensile modulus of 906 MPa. They were reinforced with 10, 20, and 30% glass fiber (length: 4.0 mm, diameter: 13.7 μm). A maximum tensile modulus of 3068 MPa was achieved with 30% glass fiber. [Prior art documents] [Patent documents]

[0011] [Patent Document 1] International Publication No. 2014 / 167493 [Patent Document 2] European Patent No. 2845876 [Patent Document 3] European Patent Application Publication No. 3406662 Summary of the Invention [Problem to be solved by the invention]

[0012] Thus, there are examples of reinforced recycled materials that simultaneously have good tensile modulus and impact strength. However, it would be advantageous to provide a polyolefin composition that also contains post-consumer recycled (PCR) materials, with properties similar to virgin polymers, to make the final solution more economically friendly in terms of CO2 footprint.

[0013] It was therefore an object of the present invention to provide a polyolefin composition having an improved stiffness-impact strength balance, comprising polyolefin material recovered from waste plastic materials. [Means for solving the problem]

[0014] This object has been achieved by providing the following polyolefin composition: a) 30 to 60 wt. % (based on the total weight of the polymer composition) of at least one polypropylene homopolymer; b) a blend (A) of recycled plastic materials containing 15 to 40% by weight (based on the total weight of the polymer composition) of polypropylene and polyethylene in a ratio of 3:7 to 10:1, recovered from waste plastic materials originating from post-consumer waste and / or industrial waste and having a melt flow rate MFR2 (230°C, 2.16 kg, measured according to ISO 1133) in the range of 8 to 14 g / 10 min; c) 17 to 50 wt. % (based on the total weight of the polymer composition) of glass fibers; d) 0.5 to 2.5 wt. % (based on the total weight of the polymer composition) of at least one coupling agent; and optionally further additives, Including, A polyolefin composition, wherein the total of all components is always added to be 100% by weight, The polyolefin composition comprises: - Melt flow rate MFR2 of at least 2 g / 10 min (230 °C, 2.16 kg, measured according to ISO 1133); - a tensile modulus of at least 4 GPa (measured according to ISO 527-2, 23 °C); and -At least 5kJ / m 2 Impact strength (Charpy 1eA +23℃) It has. [Effects of the Invention]

[0015] The recycled-containing composition is characterized by a high tensile modulus combined with high impact strength. The performance of different types of polymers and combinations of recycled and glass fiber reinforcements cannot be easily predicted. In particular, it is difficult to predict the tensile modulus due to the interactions between the various components. In addition, recycled polyolefins are typically contaminated with polar polymers (e.g., PA, PET) or other non-PO materials such as PS or fillers, making the explicit calculation of final mechanical performance more difficult.

[0016] As will be discussed in more detail below, the melt flow rate of the polyolefin composition can cover a wide spectrum and can be adjusted according to customer needs. The melt flow rate is an important indicator of flow in a mold. Changes in the melt flow rate affect the conversion interface and end-use performance. By providing polyolefin compositions with different melt flow rates, customer needs can be met. DETAILED DESCRIPTION OF THE INVENTION

[0017] It is to be understood that the present polyolefin compositions are rubber-free and essentially peroxide-free, preferably containing less than 0.5 wt. % peroxide based on the total weight of the polymer composition.

[0018] For purposes of this specification and the claims that follow, the term "recycled" is used to indicate that a material is recovered from post-consumer and / or post-industrial waste. Post-consumer waste refers to materials that have completed at least their first use cycle (or life cycle), i.e., have already fulfilled their first purpose and passed through the hands of the consumer, while post-industrial waste typically refers to manufacturing scrap that does not reach the consumer. In the context of the present invention, "recycled polymer" may also contain up to 17% by weight, preferably up to 3% by weight, more preferably up to 1% by weight, and even more preferably up to 0.1% by weight, of other components originating from said first use, based on the total weight of the recycled polymer. The type and amount of these components affect the physical properties of the recycled polymer. The physical properties shown below relate to the main components of the recycled polymer.

[0019] As further described below, typical other components from the first use are thermoplastic polymers such as polystyrene and PA6, talc, chalk, ink, wood, paper, limonene, and fatty acids. The polystyrene (PS) and polyamide 6 (PA6) content in the recycled polymer can be measured by Fourier transform infrared spectroscopy (FTIR), and the talc, chalk, wood, and paper content can be measured by thermogravimetric analysis (TGA).

[0020] The term "virgin" means a newly manufactured material and / or object that has not been recycled, before it is first used. If not, the polymer is a "virgin" polymer.

[0021] As described further below, two or more polypropylene homopolymers may be used in the polyolefin composition. At least one heterophasic polypropylene copolymer may also be added to the polyolefin composition.

[0022] The total amount of all virgin polypropylene polymers (homopolymer and heterophasic polymer) used in the polyolefin composition according to the present invention sums to a range of 30-60 wt. %, preferably 30-50 wt. %, more preferably 35-45 wt. %, even more preferably 37-40 wt. % (based on the total weight of the polymer composition).

[0023] The amount of blend (A) of recycled plastic materials recovered from waste plastic materials originating from post-consumer and / or industrial waste and containing polypropylene and polyethylene in a ratio of 3:7 to 10:1 used in the polyolefin composition is, according to the present invention, in the range of 15 to 40% by weight, preferably 25 to 40% by weight, more preferably 30 to 40% by weight (based on the total weight of the polymer composition).

[0024] The amount of glass fibers used in the polyolefin composition according to the present invention ranges from 17 to 50 wt. %, preferably from 20 to 50 wt. %, more preferably from 20 to 40 wt. %, and even more preferably from 20 to 30 wt. % (based on the total weight of the polymer composition).

[0025] The amount of at least one coupling agent used in the polyolefin composition, according to the present invention, ranges from 0.5 to 2.5 wt. %, preferably from 1 to 2 wt. % (based on the total weight of the polymer composition).

[0026] It should be understood that additional additives may be included in the polyolefin composition and that the total of all components always adds up to 100 wt. % in each of the embodiments described herein.

[0027] According to one embodiment, the polyolefin composition comprises: a) 30 to 50 wt. % (based on the total weight of the polymer composition) of at least one polypropylene homopolymer; b) a blend (A) of recycled plastic materials containing 15 to 40% by weight (based on the total weight of the polymer composition) of polypropylene and polyethylene having a melt flow rate MFR2 (230°C, 2.16 kg, measured according to ISO 1133) in the range of 8 to 14 g / 10 min, preferably 10 to 12 g / 10 min; c) 17 to 50 wt. %, preferably 20 to 50 wt. % (based on the total weight of the polymer composition) of glass fibers; d) 0.5 to 2.5 wt. % (based on the total weight of the polymer composition) of at least one coupling agent; and optionally further additives. Including, Here, all components are added so that the total always equals 100% by weight.

[0028] According to a further embodiment, the polyolefin composition comprises: a1) at least one first polypropylene homopolymer; a2) at least one second polypropylene homopolymer; wherein the at least one first polypropylene homopolymer and the at least one second polypropylene homopolymer have melt flow rates MFR2 (measured at 230°C, under a load of 2.16 kg in accordance with ISO 1133) different from each other; b) Recovered from waste plastic materials derived from post-consumer and / or industrial waste A blend of recycled plastic materials (A) containing polypropylene and polyethylene in a ratio of 3:7 to 10:1; c) glass fibers; and d) at least one coupling agent Includes:

[0029] Thus, the polyolefin composition may contain two virgin polypropylene homopolymers with different melt flow rates, allowing for tailoring of the melt flow rate of the final polyolefin composition.

[0030] Such polyolefins with two virgin polypropylene homopolymers are: a1) 20-40 wt. % of a first polypropylene homopolymer; a2) 10 to 20 wt. % of a second polypropylene homopolymer; b) a blend (A) of recycled plastic materials containing 15 to 40% by weight of polypropylene and polyethylene having a melt flow rate MFR2 (230°C, 2.16 kg, measured according to ISO 1133) in the range of 8 to 14 g / 10 min, preferably 10 to 12 g / 10 min; c) 17 to 50% by weight, preferably 20 to 50% by weight, of glass fibers; d) 0.5 to 2.5 wt. % of at least one coupling agent; and optionally further additives Including, Here, all components are added so that the total always equals 100% by weight.

[0031] According to a further embodiment, the polyolefin composition comprises: a1) at least one first polypropylene homopolymer; a2) at least one second polypropylene homopolymer; a3) at least one third polypropylene homopolymer; wherein the at least one first polypropylene homopolymer, the at least one second polypropylene homopolymer, and the at least one third polypropylene homopolymer have melt flow rates MFR2 (measured at 230°C, under a load of 2.16 kg in accordance with ISO 1133) different from one another; b) A blend of recycled plastic materials (A) containing polypropylene and polyethylene in a ratio of 3:7 to 10:1, recovered from waste plastic materials derived from post-consumer waste and / or industrial waste; c) glass fibers; and d) at least one coupling agent Includes.

[0032] Thus, the polyolefin composition may contain three virgin polypropylene homopolymers with different melt flow rates, allowing for more precise tailoring of the melt flow rate of the final polyolefin composition.

[0033] Such polyolefins, including three virgin polypropylene homopolymers, can comprise, and preferably consist of, the following components: a1) 15 to 30 wt. % of a first polypropylene homopolymer; a2) 10 to 20 wt. % of a second polypropylene homopolymer; a3) 5 to 10 wt. % of a third polypropylene homopolymer; b) a blend (A) of recycled plastic materials containing 15 to 40% by weight of polypropylene and polyethylene having a melt flow rate MFR2 (230°C, 2.16 kg, measured according to ISO 1133) in the range of 10 to 12 g / 10 min; c) 17 to 50% by weight, preferably 20 to 50% by weight, of glass fibers; d) 0.5 to 2.5 wt. % of at least one coupling agent; and optionally further additives, Here, all components are added so that the total always equals 100% by weight.

[0034] It should also be understood that more than three virgin polypropylene homopolymers, such as four or five, may be used in the polyolefin composition.

[0035] The polypropylene homopolymer used as the virgin polymer in the present polyolefin composition is selected from the group comprising: at least one polypropylene homopolymer (PPH-1) having a melt flow rate MFR2 (measured according to ISO 1133 at 230°C, 2.16 kg) in the range of 5 to 15 g / 10 min, preferably 5 to 10 g / 10 min, more preferably 8 g / 10 min; at least one polypropylene homopolymer (PPH-2) having a melt flow rate MFR2 (230°C, 2.16 kg, measured according to ISO 1133) in the range of 10 to 30 g / 10 min, preferably 15 to 25 g / 10 min, more preferably 20 g / 10 min; at least one polypropylene homopolymer (PPH-3) having a melt flow rate MFR2 (230°C, 2.16 kg, measured according to ISO 1133) in the range of 60 to 100 g / 10 min, preferably 70 to 80 g / 10 min, more preferably 75 g / 10 min; at least one polypropylene homopolymer (PPH-4) having a melt flow rate MFR2 (230°C, 2.16 kg, measured according to ISO 1133) in the range of 100 to 150 g / 10 min, preferably 110 to 130 g / 10 min, more preferably 125 g / 10 min; at least one polypropylene homopolymer (PPH-5) having a melt flow rate MFR2 (230 ° C, 2.16 kg, measured according to ISO 1133) in the range of 600 to 1000 g / 10 min, preferably 700 to 900 g / 10 min, preferably 800 g / 10 min; At least one polypropylene homopolymer (PPH-6) having a melt flow rate MFR2 (measured at 230°C, 2.16 kg, according to ISO 1133) in the range of less than or equal to -1.5 g / 10 min, preferably in the range of 0.15 to 0.5 g / 10 min, more preferably in the range of 0.3 to 0.45 g / 10 min, and even more preferably 0.2 g / 10 min.

[0036] [Virgin polypropylene polymer] The properties and characteristics of various polypropylene homopolymers that may be used in the polyolefin composition are described below.

[0037] [Polypropylene homopolymer (PPH-1)] The at least one polypropylene homopolymer (PPH-1) has a melt flow rate MFR2 (measured at 230°C, 2.16 kg, according to ISO 1133) in the range of 5 to 15 g / 10 min, preferably 5 to 10 g / 10 min, more preferably 8 g / 10 min, and has a stiffness greater than 1300 MPa.

[0038] The polypropylene homopolymer (PPH-1) has a melting temperature of at least 150° C., preferably at least 158° C., preferably in the range of 158 to 167° C., for example 162° C. The polypropylene homopolymer (PPH-1) may have a flexural modulus, measured according to ISO 178, of at least 500 MPa, preferably at least 1000 MPa, preferably in the range of 1200 to 2000 MPa, for example 1400 MPa.

[0039] A preferred material as polypropylene homopolymer (PPH-1) is commercially available, inter alia, from Borealis AG (Austria) under the trade name HD601CF. Alternative suitable materials are highly crystalline polypropylene homopolymers, as described, for example, in WO 03 / 031174 A2.

[0040] [Polypropylene homopolymer (PPH-2)] The at least one polypropylene homopolymer (PPH-2) has a melt flow rate MFR2 (measured according to ISO 1133 at 230°C, 2.16 kg) in the range of 10 to 30 g / 10 min, preferably 15 to 25 g / 10 min, preferably 20 g / 10 min, and a stiffness greater than 1800 MPa.

[0041] The polypropylene homopolymer (PPH-2) consists essentially of propylene units, i.e., greater than 99.7% by weight, and even more preferably at least 99.8% by weight, based on the weight of the propylene homopolymer (PPH-2). In a preferred embodiment, only propylene units are detectable in the propylene homopolymer (PPH-2).

[0042] The polypropylene homopolymer (PPH-2) is understood to be characterized by a low amount of xylene cold soluble (XCS) fraction. The polypropylene homopolymer (PPH-2) may have an amount of xylene cold soluble (XCS) fraction of 4.0 wt % or less, preferably 3.0 wt % or less, more preferably 2.5 wt % or less, for example, in the range of 0.1 to 4.0 wt %, preferably 0.1 to 3.0 wt %, more preferably 0.1 to 2.5 wt %, based on the weight of the polypropylene homopolymer (PPH-2).

[0043] The polypropylene homopolymer (PPH-2) may have a heat deflection temperature (HDT) measured in accordance with ISO 75-2 of at least 90°C, preferably at least 100°C, more preferably at least 115°C, for example in the range of 90 to 160°C, preferably in the range of 100 to 150°C, more preferably 115 to 130°C.

[0044] Polypropylene homopolymer (PPH-2) has a Charpy impact strength of at least 1.0 kJ / m2 measured at 23°C in accordance with ISO 179-1eA:2000. 2 , preferably at least 2.0 kJ / m 2 , e.g., 1.0 to 10 kJ / m 2 in the range of 2.0 to 5.0 kJ / m 2 in the range of, for example, 2.5 kJ / m 2 The polypropylene homopolymer (PPH-2) may have a flexural modulus, measured in accordance with ISO 178, of at least 500 MPa, preferably at least 1500 MPa, for example in the range of 500 to 3500 MPa, preferably in the range of 1500 to 2500 MPa, for example 2000 MPa.

[0045] The polypropylene homopolymer (PPH-2) may contain a nucleating agent, preferably a polymeric nucleating agent, more preferably an α-nucleating agent, such as a polymeric α-nucleating agent. The content of the α-nucleating agent in the polypropylene homopolymer (PPH-2) is preferably 5.0 wt% or less. In a preferred embodiment, the polypropylene homopolymer (PPH-2) contains 3000 ppm or less, more preferably 1 to 2000 ppm, of the α-nucleating agent.

[0046] Polypropylene homopolymer (PPH-2) is known in the art and is commercially available. A suitable example is HF955MO from Borealis AG.

[0047] [Polypropylene homopolymer (PPH-3)] At least one polypropylene homopolymer (PPH-3) has a melt flow rate MFR2 (230°C, 2.16 kg, according to ISO 1133) in the range of 60 to 100 g / 10 min, preferably in the range of 70 to 80 g / 10 min, and even more preferably 75 g / 10 min. (measured) and has a stiffness higher than 1300 MPa.

[0048] The polypropylene homopolymer (PPH-3) consists essentially of propylene units, i.e., greater than 99.7% by weight, and even more preferably at least 99.8% by weight, based on the weight of the polypropylene homopolymer (PPH-3). In a preferred embodiment, only propylene units are detectable in the polypropylene homopolymer (PPH-3).

[0049] It is understood that the polypropylene homopolymer (PPH-3) is characterized by a low amount of cold xylene soluble (XCS) fraction. The polypropylene homopolymer (PPH-3) can have an amount of cold xylene soluble (XCS) fraction of 4.0 wt % or less, preferably 3.5 wt % or less, for example, in the range of 0.1 to 4.0 wt %, preferably in the range of 0.1 to 3.5 wt %, based on the weight of the polypropylene homopolymer (PPH-3).

[0050] The polypropylene homopolymer (PPH-3) may have a heat deflection temperature (HDT) measured in accordance with ISO 75-2 of at least 50°C, preferably at least 60°C, more preferably at least 75°C, for example, in the range of 50 to 120°C, preferably in the range of 60 to 100°C, more preferably 75 to 90°C.

[0051] Polypropylene homopolymer (PPH-3) has a thermal conductivity of at least 0.5 kJ / m 2 , preferably at least 0.7 kJ / m 2 , e.g., 0.5 to 1.5 kJ / m 2 in the range of 0.7 to 1.3 kJ / m 2 range, e.g., 1.0 kJ / m 2 The polypropylene homopolymer (PPH-3) may have a Charpy notched impact strength (NIS), measured in accordance with ISO 179-1eA at 23°C, of ​​at least 500 MPa, preferably at least 1000 MPa, for example in the range of 500 to 2500 MPa, preferably in the range of 1000 to 2000 MPa, for example 1500 MPa.

[0052] It is understood that when the polypropylene homopolymer (PPH-3) includes an α-nucleating agent, the polypropylene homopolymer (PPH-3) may include the α-nucleating agent in an amount of up to 5.0 wt %, preferably up to 3000 ppm, for example, in the range of 1 to 2000 ppm, based on the weight of the polypropylene homopolymer (PPH-3). However, in a preferred embodiment, the polypropylene homopolymer (PPH-2) does not include any nucleating agent, i.e., the polypropylene homopolymer (PPH-2) is not nucleated.

[0053] Polypropylene homopolymer (PPH-3) is known in the art and is commercially available. A suitable example is HJ120UB from Borealis AG.

[0054] [Polypropylene homopolymer (PPH-4)] The at least one polypropylene homopolymer (PPH-4) has a melt flow rate MFR2 (measured according to ISO 1133 at 230°C and 2.16 kg) in the range of 100 to 150 g / 10 min, preferably 110 to 130 g / 10 min, more preferably 125 g / 10 min.

[0055] Polypropylene homopolymer (PPH-4) has a Charpy notched impact strength (NIS) of at least 0.5 kJ / m2 measured at 23°C in accordance with ISO 179-1eA. 2 , preferably at least 0.7 kJ / m 2 , e.g., 0.5 to 1.5 kJ / m 2 in the range of 0.7 to 1.3 kJ / m 2 range, e.g., 1.0 kJ / m 2 The polypropylene homopolymer (PPH-3) may have a flexural modulus measured in accordance with ISO 178 of at least 500 MPa, preferably at least 1000 MPa, for example in the range of 500 to 2500 MPa, preferably in the range of 1000 to 2000 MPa, for example 1550 MPa. It may be Pa.

[0056] Polypropylene homopolymer (PPH-4) is known in the art and is commercially available. A suitable example is HK060AE from Borealis AG.

[0057] [Polypropylene homopolymer (PPH-5)] The at least one polypropylene homopolymer (PPH-5) has a melt flow rate MFR2 (measured according to ISO 1133 at 230°C and 2.16 kg) in the range of 600 to 1000 g / 10 min, preferably 700 to 900 g / 10 min, preferably 800 g / 10 min.

[0058] The polypropylene homopolymer (PPH-5) has a melting temperature of at least 140°C, preferably at least 150°C, preferably in the range of 150-160°C, for example 158°C.

[0059] Polypropylene homopolymer (PPH-5) is known in the art and is commercially available. A suitable example is HL708FB from Borealis AG.

[0060] [Polypropylene homopolymer (PPH-6)] The at least one polypropylene homopolymer (PPH-6) has a melt flow rate MFR2 (measured at 230°C, 2.16 kg, according to ISO 1133) of 1.5 g / 10 min or less, preferably in the range of 0.15 to 0.5 g / 10 min, more preferably 0.3 to 0.45 g / 10 min, and even more preferably 0.2 g / 10 min, and has a stiffness greater than 1300 MPa.

[0061] Generally, the high molecular weight linear polypropylene homopolymer (PPH-6) has a weight average molecular weight (Mw) of at least 750 kg / mol. Preferably, the high molecular weight linear polypropylene homopolymer (PPH-6) has a weight average molecular weight (Mw) in the range of 750 to 2000 kg / mol, more preferably in the range of 800 to 1500 kg / mol.

[0062] Polypropylene homopolymer (PPH-6) has a Charpy notched impact strength (NIS) of 5 to 10 kJ / m, measured at 23°C according to ISO 179-1eA. 2 in the range of 7 kJ / m 2 The polypropylene homopolymer (PPH-6) may have a tensile modulus, measured in accordance with ISO 527-2, of at least 1000 MPa, preferably at least 1500 MPa, more preferably in the range of 1000 to 2000 MPa, for example 1650 MPa.

[0063] Polypropylene homopolymer (PPH-6) is known in the art and is commercially available. A suitable example is BE50 from Borealis AG.

[0064] In yet another preferred embodiment, the polyolefin composition may comprise, in addition to at least one polypropylene homopolymer, at least one heterophasic polypropylene copolymer, which comprises a polypropylene matrix and an elastomeric copolymer as polymeric components.

[0065] In a further embodiment, the polyolefin composition comprises: a1) at least one first polypropylene homopolymer; a2) optionally at least one second polypropylene homopolymer; wherein said at least one first polypropylene homopolymer and said optional at least one second polypropylene homopolymer have melt flow rates MF R2 (measured at 230°C, 2.16 kg load, according to ISO1133) is different from each other, a4) at least one heterophasic polypropylene copolymer; b) A blend of recycled plastic materials (A) containing polypropylene and polyethylene in a ratio of 3:7 to 10:1, recovered from post-consumer industrial waste and / or waste plastic materials derived from industrial waste; c) glass fibers; and d) at least one coupling agent Includes:

[0066] Such polyolefins having one or two virgin polypropylene homopolymers and at least one heterophasic polypropylene copolymer may comprise, and preferably consist of, the following components: a1) 15 to 30 wt. % of a first polypropylene homopolymer; a2) optionally 10 to 20 wt. % of a second polypropylene homopolymer; a4) 10-20 wt. % heterophasic polypropylene homopolymer; b) a blend (A) of recycled plastic materials containing 15 to 40% by weight of polypropylene and polyethylene having a melt flow rate MFR2 (230°C, 2.16 kg, measured according to ISO 1133) in the range of 10 to 12 g / 10 min; c) 20-50% by weight of glass fibers; d) 0.5 to 2.5 wt. % of at least one coupling agent; and optionally further additives, Here, all components are added so that the total always equals 100% by weight.

[0067] Such heterophasic polypropylene copolymers include It may also be at least one heterophasic polypropylene copolymer (PPHeco-1) having a melt flow rate MFR2 (230°C, 2.16 kg, measured according to ISO 1133) in the range of 15 to 20 g / 10 min, preferably 18 g / 10 min.

[0068] [Heterophasic Polypropylene Copolymer (PPHeco-1)] The at least one heterophasic polypropylene copolymer (PPHeco-1) has a melt flow rate MFR2 (measured according to ISO 1133 at 230°C, 2.16 kg) in the range of 15 to 25 g / 10 min, preferably 15 to 20 g / 10 min, more preferably 18 g / 10 min.

[0069] Heterophasic polypropylene copolymer (PPHeco-1) has a Charpy notched impact strength (NIS) of at least 20 kJ / m, measured at 23°C according to ISO 179-1eA. 2 , preferably at least 30 kJ / m 2 , e.g., 20 to 50 kJ / m 2 in the range of 30 to 40 kJ / m 2 range, e.g., 35 kJ / m 2The heterophasic polypropylene copolymer (PPHeco-1) may have a flexural modulus, measured according to ISO 178, of at least 300 MPa, preferably at least 500 MPa, for example in the range of 500 to 1500 MPa, preferably in the range of 500 to 1000 MPa, for example 800 MPa.

[0070] Heterophasic polypropylene copolymers (PPHeco-1) are known in the art and are commercially available. A suitable example is EF015AE from Borealis AG.

[0071] As mentioned above, the melt flow rate of the polyolefin composition may vary. Thus, the polyolefin composition may have a melt flow rate MFR2 (ISO 1133, 2.16 kg, 230°C) in the range of 2 to 20 g / 10 min, preferably 3 to 17 g / 10 min, more preferably 5 to 15 g / 10 min, and even more preferably 10 to 15 g / 10 min. , measured in accordance with ISO 1133).

[0072] In one embodiment, the polyolefin composition has a tensile modulus (ISO 527-2) of at least 4.0 GPa, preferably at least 4.5 GPa, more preferably at least 5.5 GPa, preferably at least 6 GPa, more preferably at least 6.5 GPa, even more preferably at least 6.8 GPa, especially in the range of 4 to 14 GPa, more especially in the range of 4.5 to 12 GPa.

[0073] In a further embodiment, the polyolefin composition has a viscosity of at least 5.0 kJ / m 2 , preferably at least 6.0 kJ / m 2 , more preferably at least 7 kJ / m 2 , and even more preferably at least 7.5 kJ / m 2 , more preferably at least 8 kJ / m 2 , and even more preferably at least 8.5 kJ / m 2 , especially 5.0 to 12.0 kJ / m 2in the range of 5.5 to 10 kJ / m 2 It has an impact strength in the range of (ISO179; Charpy 1eA +23°C).

[0074] More specific embodiments of the present composition are described below.

[0075] In the first embodiment, a1) 30-40% by weight (based on the total weight of the polymer composition) of at least one polypropylene homopolymer (PPH-1) having a melt flow rate MFR2 (230°C, 2.16 kg, measured according to ISO 1133) in the range of 5-15 g / 10 min, preferably 5-10 g / 10 min, more preferably 8 g / 10 min; b) a blend (A) of recycled plastic materials containing 30 to 40% by weight (based on the total weight of the polymer composition) of polypropylene and polyethylene having a melt flow rate MFR2 (230°C, 2.16 kg, measured according to ISO 1133) in the range of 8 to 14 g / 10 min, preferably 10 to 12 g / 10 min; c) 17 to 30% by weight, preferably 20 to 30% by weight (based on the total weight of the polymer composition) of glass fibers; d) 1 to 2 wt. % (based on the total weight of the polymer composition) of at least one coupling agent; and optionally further additives. Including, Here, a polyolefin composition is provided, with all components always being added together to add up to 100% by weight.

[0076] Such a first polyolefin composition is a melt flow rate MFR2 (measured according to ISO 1133 at 230 ° C, 2.16 kg) in the range of 2 to 5 g / 10 min, preferably in the range of 3.5 to 5 g / 10 min, more preferably in the range of 4 to 4.5 g / 10 min; a tensile modulus (ISO 527-2) of at least 6 GPa, preferably at least 6.5 GPa, preferably at least 6.7 GPa, more preferably at least 6.8 GPa, even more preferably at least 6.9 GPa; and -At least 8kJ / m 2 , preferably at least 8.2 kJ / m 2 , preferably at least 8.4 kJ / m 2 , more preferably at least 8.5 kJ / m 2 Impact strength (Charpy 1eA +23℃) may have:

[0077] In the second embodiment, a1) 30-50% by weight of at least one propylene homopolymer (PPH-1) having a melt flow rate MFR2 (230°C, 2.16 kg, measured according to ISO 1133) in the range of 6-12 g / 10 min, preferably 8 g / 10 min; a2) 15-20% by weight of at least one propylene homopolymer (PPH-6) having a melt flow rate MFR2 (230°C, 2.16 kg, measured according to ISO 1133) of 1.5 g / 10 min or less, preferably in the range of 0.15-0.5 g / 10 min, more preferably 0.2 g / 10 min; b) a blend (A) of recycled plastic materials containing 25-40% by weight of polypropylene and polyethylene having a melt flow rate MFR2 (230°C, 2.16 kg, measured according to ISO 1133) in the range of 10-12 g / 10 min; c) 17 to 30% by weight, preferably 20 to 30% by weight, of glass fibers; d) 0.5 to 2.0% by weight, in particular 1% by weight, of at least one coupling agent; and optionally further additives Including, Here, a polyolefin composition is provided, with all components always being added together to add up to 100% by weight.

[0078] Such a second polyolefin composition may be - melt flow rate MFR2 in the range of 2-3 g / 10 min, preferably 2-2.5 g / 10 min (measured at 230 ° C, 2.16 kg, according to ISO 1133); a tensile modulus (ISO 527-2) of at least 4.5 GPa, preferably at least 4.7 GPa, more preferably at least 4.8 GPa; and -At least 7kJ / m 2 , preferably at least 7.5 kJ / m 2 , preferably at least 7.6 kJ / m 2 , more preferably at least 7.8 kJ / m 2 , and even more preferably at least 7.9 kJ / m 2 Impact strength (Charpy 1eA +23℃) may have:

[0079] In a third embodiment, a1) 20-40% by weight of at least one polypropylene homopolymer (PPH-2) having a melt flow rate MFR2 (230°C, 2.16 kg, measured according to ISO 1133) in the range of 10-30 g / 10 min, preferably 15-25 g / 10 min, more preferably 20 g / 10 min; a2) 8-20% by weight of at least one polypropylene homopolymer (PPH-5) having a melt flow rate MFR2 (230°C, 2.16 kg, measured according to ISO 1133) in the range of 600-1000 g / 10 min, preferably 700-900 g / 10 min, preferably 800 g / 10 min; b) a blend (A) of recycled plastic materials containing 30-40% by weight of polypropylene and polyethylene having a melt flow rate MFR2 (230°C, 2.16 kg, measured according to ISO 1133) in the range of 10-12 g / 10 min; c) 17 to 30% by weight, preferably 20 to 30% by weight, of glass fibers; d) 1 to 2.0 wt. % of at least one coupling agent; and optionally further additives. Including, Here, a polyolefin composition is provided, with all components always being added together to add up to 100% by weight.

[0080] Such a third polyolefin composition is - melt flow rate MFR2 in the range of 15-20 g / 10 min, preferably 17-18 g / 10 min (measured at 230 ° C, 2.16 kg, according to ISO 1133); a tensile modulus (ISO 527-2) of at least 6.5 GPa, preferably at least 4.7 GPa, more preferably at least 4.8 GPa; and -At least 6.0kJ / m 2 , preferably at least 6.2 kJ / m 2 Impact strength (Charpy 1eA +23℃) may have:

[0081] In the fourth embodiment, a1) 10-20% by weight of at least one polypropylene homopolymer (PPH-2) having a melt flow rate MFR2 (230°C, 2.16 kg, measured according to ISO 1133) in the range of 10-30 g / 10 min, preferably 15-25 g / 10 min, more preferably 20 g / 10 min; a2) 20-40% by weight of at least one polypropylene homopolymer (PPH-4) having a melt flow rate MFR2 (230°C, 2.16 kg, measured according to ISO 1133) in the range of 100-150 g / 10 min, preferably 110-130 g / 10 min, more preferably 125 g / 10 min; b) a blend (A) of recycled plastic materials containing 30-40% by weight of polypropylene and polyethylene having a melt flow rate MFR2 (230°C, 2.16 kg, measured according to ISO 1133) in the range of 10-12 g / 10 min; c) 17 to 30% by weight, preferably 20 to 30% by weight, of glass fibers; d) 1 to 2.0 wt. % of at least one coupling agent; and optionally further additives. Including, Here, a polyolefin composition is provided, with all components always being added together to add up to 100% by weight.

[0082] Such a fourth polyolefin composition comprises: - Melt flow rate MFR2 in the range of 10-15 g / 10 min, preferably 12-13 g / 10 min (measured at 230 ° C, 2.16 kg, according to ISO 1133); a tensile modulus (ISO 527-2) of at least 6.5 GPa, preferably at least 4.7 GPa, more preferably at least 4.8 GPa; and -At least 6.0kJ / m 2 , preferably at least 6.3 kJ / m 2 Impact strength (Charpy 1eA +23℃) may have:

[0083] In the fifth embodiment, a1) 10-20% by weight of at least one polypropylene homopolymer (PPH-2) having a melt flow rate MFR2 (230°C, 2.16 kg, measured according to ISO 1133) in the range of 10-30 g / 10 min, preferably 15-25 g / 10 min, more preferably 20 g / 10 min; a2) 15-30% by weight of at least one polypropylene homopolymer (PPH-3) having a melt flow rate MFR2 (230°C, 2.16 kg, measured according to ISO 1133) in the range of 60-100 g / 10 min, preferably 70-80 g / 10 min, more preferably 75 g / 10 min; a3) 4 to 10% by weight of at least one propylene homopolymer (PPH-6) having a melt flow rate MFR2 (230°C, 2.16 kg, measured according to ISO 1133) of 1.5 g / 10 min or less, preferably in the range of 0.15 to 0.5 g / 10 min, more preferably 0.2 g / 10 min; b) a blend (A) of recycled plastic materials containing 25-40% by weight of polypropylene and polyethylene having a melt flow rate MFR2 (230°C, 2.16 kg, measured according to ISO 1133) in the range of 10-12 g / 10 min; c) 17 to 20% by weight, preferably 20 to 30% by weight, of glass fibers; d) 1 to 2% by weight of at least one coupling agent; and optionally further additives Including, Here, the polyolefin is added so that the total of all components is always 100% by weight. A composition is provided.

[0084] Such a fifth polyolefin composition comprises: - Melt flow rate MFR2 in the range of 5 to 15 g / 10 min, preferably 6 to 10 g / 10 min (measured at 230 ° C, 2.16 kg, according to ISO 1133); a tensile modulus (ISO 527-2) of at least 4 GPa, preferably at least 5 GPa, more preferably at least 6 GPa, even more preferably at least 6.5 GPa; and -At least 6.0kJ / m 2 , preferably at least 7 kJ / m 2 , more preferably at least 7.5 kJ / m 2 Impact strength (Charpy 1eA +23℃) may have:

[0085] In a sixth embodiment, a1) 20-30% by weight of at least one polypropylene homopolymer (PPH-4) having a melt flow rate MFR2 (230°C, 2.16 kg, measured according to ISO 1133) in the range of 100-150 g / 10 min, preferably 110-130 g / 10 min, more preferably 125 g / 10 min; a4) 10-20% by weight of at least one heterophasic polypropylene copolymer (PPHeco-1) having a melt flow rate MFR2 (230°C, 2.16 kg, measured according to ISO 1133) in the range of 15-20 g / 10 min, preferably 18 g / 10 min; b) a blend (A) of recycled plastic materials containing 25-40% by weight of polypropylene and polyethylene having a melt flow rate MFR2 (230°C, 2.16 kg, measured according to ISO 1133) in the range of 10-12 g / 10 min; c) 17 to 30% by weight, preferably 20 to 30% by weight, of glass fibers; d) 1 to 2% by weight of at least one coupling agent; and optionally further additives Including, Here, a polyolefin composition is provided, with all components always being added together to add up to 100% by weight.

[0086] Such a sixth polyolefin composition comprises: - Melt flow rate MFR2 in the range of 10-15 g / 10 min, preferably 12-13 g / 10 min (measured at 230 ° C, 2.16 kg, according to ISO 1133); a tensile modulus (ISO 527-2) of at least 4 GPa, preferably at least 4.4 GPa; and -At least 6.0kJ / m 2 , preferably at least 7 kJ / m 2 , more preferably at least 7.5 kJ / m 2 Impact strength (Charpy 1eA +23℃) may have:

[0087] In the seventh embodiment, a1) 10-20% by weight of at least one polypropylene homopolymer (PPH-2) having a melt flow rate MFR2 (230°C, 2.16 kg, measured according to ISO 1133) in the range of 10-30 g / 10 min, preferably 15-25 g / 10 min, more preferably 20 g / 10 min; a2) 10-20% by weight of at least one polypropylene homopolymer (PPH-4) having a melt flow rate MFR2 (230°C, 2.16 kg, measured according to ISO 1133) in the range of 100-150 g / 10 min, preferably 110-130 g / 10 min, more preferably 125 g / 10 min; a4) 8-12% by weight of at least one heterophasic polypropylene copolymer (PPHeco-1) having a melt flow rate MFR2 (230°C, 2.16 kg, measured according to ISO 1133) in the range of 15-20 g / 10 min, preferably 18 g / 10 min, b) a blend (A) of recycled plastic materials containing 25-40% by weight of polypropylene and polyethylene having a melt flow rate MFR2 (230°C, 2.16 kg, measured according to ISO 1133) in the range of 10-12 g / 10 min; c) 17 to 30% by weight, preferably 20 to 30% by weight, of glass fibers; d) 1 to 2% by weight of at least one coupling agent; and optionally further additives Including, Here, a polyolefin composition is provided, with all components always being added together to add up to 100% by weight.

[0088] Such a seventh polyolefin composition comprises: - Melt flow rate MFR2 in the range of 5 to 15 g / 10 min, preferably 10 to 13 g / 10 min (measured at 230 ° C, 2.16 kg, according to ISO 1133); a tensile modulus (ISO 527-2) of at least 4 GPa, preferably at least 4.5 GPa; and -At least 6.0kJ / m 2 , preferably at least 7 kJ / m 2 , more preferably at least 7.2 kJ / m 2 Impact strength (Charpy 1eA +23℃) may have:

[0089] [Recycled Material Blend (A)] Blend (A) is obtained from a recycled waste stream. Blend (A) can be either recycled post-consumer waste or industrial waste, such as from the automotive industry, or a combination of both. It is particularly preferred that blend (A) consists of recycled post-consumer waste and / or industrial waste.

[0090] In one embodiment, blend (A) may be a polypropylene (PP)-rich recycled plastic material, containing significantly more polypropylene than polyethylene. Polypropylene-rich recycled waste streams can be obtained, for example, from the automotive industry; in particular, some automotive parts, such as bumpers, are a source of fairly pure polypropylene material in the recycling stream, or can be obtained by intensive sorting. PP-rich materials can be obtained by selective processing, degassing and filtration, and / or by separation according to type and color, such as NIR or Raman sorting and VIS sorting. They can also be obtained from domestic waste streams (i.e., the product of domestic recycling), such as the "yellow bag" recycling system organized under the "Green Dot" organization operating in some regions of Germany.

[0091] Preferably, the polypropylene-rich recycled material is obtained from recycled waste by means of plastic recycling processes known in the art. Such PP-rich recycled products are commercially available from, for example, Corepla (Italian Consortium for the Collection, Recovery, and Recycling of Packaging Plastic Waste), Resource Plastics Corp. (Brampton, ON), Kruschitz GmbH, Plastics and Recycling (AT), Vogt Plastik GmbH (DE), Mtm ​​Plastics GmbH (DE), etc. Non-exhaustive examples of polypropylene-rich recycled materials include Purpolen® PP (Mtm Plastics GmbH), Axpoly® recycled polypropylene pellets (Axion Ltd), and PolyPropylene Copolymer (BSP Compounds). It is believed that the present invention may be applicable to a wide range of recycled polypropylene materials or materials or compositions with a high recycled polypropylene content. The polypropylene-rich recycled material may be in the form of granules.

[0092] The PP-rich blend (A) may have a relative amount of units derived from propylene of more than 50% by weight, preferably more than 53% by weight, more preferably more than 60% by weight, more preferably more than 70% by weight, more preferably more than 75% by weight, more preferably more than 80% by weight, even more preferably more than 90% by weight, and even more preferably more than 95% by weight, based on the total weight of the composition.

[0093] It is to be understood that the PP present in the PP-rich blend is preferably isotactic polypropylene. In one embodiment, the PP-rich blend (A) may preferably have a content of isotactic polypropylene of 50% to 80% by weight relative to the total weight of the blend (A).

[0094] Furthermore, the PP-rich blend (A) may have a relative amount of units derived from ethylene of less than 47% by weight, more preferably less than 40% by weight, more preferably less than 30% by weight, more preferably less than 20% by weight, and most preferably less than 10% by weight. Typically, the relative amount of units derived from ethylene is greater than 5% by weight, relative to the total weight of the composition. It should be understood that the ethylene present is preferably ethylene derived from polyethylene and ethylene-containing copolymers.

[0095] The polyethylene fraction of the recycled material can include recycled high density polyethylene (rHDPE), recycled medium density polyethylene (rMDPE), recycled low density polyethylene (rLDPE), linear low density polyethylene (LLDPE), and mixtures thereof. In certain embodiments, the recycled material has a density of 0.8 g / cm 3 More than 0.9 g / cm 3 more than 0.91 g / cm 3 and high density polyethylene having an average density greater than 1000 .mu.m.

[0096] Blend (A) may also have a relative amount of polystyrene of 0 to 5.0 wt%, preferably 0.5 to 4.0 wt%, more preferably 1.0 to 3.0 wt%, most preferably 1.5 to 2.5 wt%.

[0097] According to the present invention, blend (A) has a limonene content of 0.1 ppm to 100 ppm, more preferably 1 ppm to 50 ppm, and most preferably 2 ppm to 35 ppm, as determined using solid-phase microextraction (HS-SPME-GC-MS). Limonene is traditionally found in recycled polyolefin materials, originating from packaging applications in the fields of cosmetics, detergents, shampoos, and similar products. Thus, blend (A) contains limonene when blend (A) contains materials derived from such types of household waste streams.

[0098] The fatty acid content is yet another indicator of the recycled origin of blend (A). However, in some cases, due to specific treatments in the recycling process, the fatty acid content may be below the detection limit. According to the present invention, blend (A) preferably has a fatty acid content determined using solid-phase microextraction (HS-SPME-GC-MS) of 1 ppm to 200 ppm, preferably 1 ppm to 150 ppm, more preferably 2 ppm to 100 ppm, and most preferably 3 ppm to 80 ppm.

[0099] In a preferred embodiment, blend (A) (i) contains less than 5% by weight, preferably less than 1.5% by weight, of polystyrene; and / or (ii) contains less than 3.5% by weight, preferably less than 1% by weight, of talc; and / or (iii) contains less than 1.0% by weight, preferably less than 0.5% by weight, of polyamide.

[0100] Being of recycled origin, blend (A) also contains organic fillers and / or It may contain inorganic fillers and / or additives in an amount of up to 10% by weight, preferably 3% by weight, relative to the weight of blend (A).

[0101] Thus, in one embodiment of the polyolefin composition, the blend of recycled plastic materials (A) comprises: A-1) 50 to 99% by weight of polypropylene content; A-2) polyethylene content of 2 to 40% by weight; A-3) 0 to 5.0% by weight of polystyrene and / or copolymers such as ABS, A-4) 0 to 3.0% by weight of a stabilizer, A-5) 0 to 4.0% by weight of polyamide-6, A-6) 0 to 3.0% by weight of talc, A-7) 0 to 3.0% by weight of chalk, A-8) 0 to 1.0% by weight of paper, A-9) 0 to 1.0% by weight of wood, A-10) 0 to 0.5% by weight of metal, A-11) 0.1 ppm to 100 ppm of limonene, as determined using solid-phase microextraction (HS-SPME-GC-MS), and A-12) Total fatty acid content of 0-200 ppm determined using solid phase microextraction (HS-SPME-GC-MS) wherein all amounts are given relative to the total weight of blend (A).

[0102] As noted above, blend (A) may comprise one or more additional components selected from: Based on the total weight of blend (A), A-4) 3.0% by weight or less of a stabilizer, preferably 2.0% by weight or less of a stabilizer; A-5) 4.0% by weight or less of polyamide-6, preferably 2.0% by weight or less of polyamide-6; A-6) 3.0% by weight or less of talc, preferably 1.0% by weight or less of talc; A-7) 3.0% by weight or less of chalk, preferably 1.0% by weight or less of chalk; A-8) 1.0% by weight or less of paper, preferably 0.5% by weight or less of paper; A-9) 1.0% by weight or less of wood, preferably 0.5% by weight or less of wood, and A-10) 0.5% by weight or less of metal, preferably 0.1% by weight or less of metal.

[0103] Blend (A) may have a melt flow rate (ISO1133, 2.16 kg, 230° C.) of 4 to 20 g / 10 min, preferably 5 to 15 g / 10 min, more preferably 6 to 12 g / 10 min.

[0104] [Glass fiber, coupling agent, additive] As mentioned above, the polyolefin composition according to the present invention contains glass fibers, particularly short glass fibers. Preferably, the glass fibers used in the fiber-reinforced composite have an average fiber length in the range of 2.0 to 10.0 mm, preferably in the range of 2.0 to 8.0 mm, even more preferably in the range of 2.0 to 6.0 mm, even more preferably in the range of 3.0 to 5.5 mm, and even more preferably in the range of 3.5 to 5.0 mm.

[0105] More preferably, the short glass fibers used in the fiber-reinforced composite have an average diameter of 5 to 20 μm, more preferably 8 to 18 μm, even more preferably 8 to 15 μm, even more preferably 10 to 15 μm, preferably 11 to 14 μm, preferably 12 to 14 μm, more preferably 12.3 to 13.7 μm, even more preferably 12.5 to 13.5 μm.

[0106] In one preferred embodiment, glass fibers having a fiber length of 3.0 to 5.0 mm (average 4.0 mm) and a fiber diameter of 12.3 to 13.7 μm (average 13 μm) are used. In another preferred embodiment, glass fibers having a fiber length of 3.5 to 5.5 mm (average 4.5 mm) and a fiber diameter of 12 to 14 μm (average 13 μm) are used.

[0107] As mentioned above, the polyolefin composition according to the present invention also includes at least one coupling agent. The at least one coupling agent is a functionalized polypropylene, particularly a polypropylene functionalized with maleic anhydride (MAH). The amount of coupling agent in the polyolefin composition may be 1 to 2 wt %, for example, 1 wt % or 1.25 wt %.

[0108] In a further embodiment, the polyolefin composition may contain further additives. Examples of additives for use in the composition include pigments or dyes (e.g., carbon black), stabilizers (antioxidants), antioxidants and / or anti-UV agents, antistatic agents, nucleating agents, and utilization agents (processing aids, etc.). Preferred additives are carbon black, at least one antioxidant, and / or at least one UV stabilizer.

[0109] Generally, the amount of these additives is in the range of 0 to 5.0% by weight, preferably in the range of 0.01 to 3.0% by weight, more preferably 0.01 to 2.0% by weight, based on the weight of the total composition.

[0110] Examples of antioxidants commonly used in the art include sterically hindered phenols (such as CAS No. 6683-19-8, also sold under the trademark Irganox 1010 FF by BASF), phosphorus-based antioxidants (such as CAS No. 31570-04-4, also sold under the trademark Hostanox PAR 24 (FF) by Clariant or under the trademark Irgafos 168 (FF) by BASF), sulfur-based antioxidants (such as CAS No. 693-36-7, sold under the trademark Irganox PS-802 FL by BASF), and nitrogen-based antioxidants (such as 4,4'-bis(1,1'-dimethylbenzyl)diphenylamine). Preferred antioxidants may be tris(2,4-di-t-butylphenyl)phosphite and / or octadecyl 3-(3',5'-di-t-butyl-4-hydroxyphenyl)propionate.

[0111] Antiacid agents are also commonly known in the art, such as calcium stearate, sodium stearate, zinc stearate, magnesium oxide and zinc oxide, synthetic hydrotalcites (e.g., SHT, CAS No. 11097-59-9), lactates and lactylates, and calcium stearate (CAS No. 1592-23-0) and zinc stearate (CAS No. 557-05-1).

[0112] Common antiblocking agents are natural silicas, such as diatomaceous earth (CAS No. 60676-86-0 (SuperfFloss™), CAS No. 60676-86-0 (SuperFloss E™) or CAS No. 60676-86-0 (Celite™) 499 (trademark)); synthetic silica (CAS No. 7631-86-9, CAS No. 7631-86-9, CAS No. 7631-86-9, CAS No. 7631-86-9, CAS No. 7631-86-9, CAS No. 7631-86-9, CAS No. 112926-00-8, CAS No. 7631-86-9, or CAS No. 7631-86-9); silicates (e.g., aluminum silicate (kaolin) (CAS No. 1318-74-7), sodium aluminum silicate (CAS No. 1344-00-9), calcined kaolin (CAS No. 92704-41-1), aluminum silicate ( CAS No. 1327-36-2), or calcium silicate (CAS No. 1344-95-2); synthetic zeolites (e.g., sodium calcium aluminosilicate hydrate calcium aluminosilicate hydrate, CAS No. 1344-01-0, CAS No. 1344-01-0), or sodium calcium aluminosilicate hydrate (CAS No. 1344-01-0).

[0113] Anti-UV agents are, for example, bis(2,2,6,6-tetramethyl-4-piperidyl)-sebacate (CAS number 52829-07-9, Tinuvin 770); 2-hydroxy-4-n-octoxy-benzophenone (CAS number 1843-05-6, Chimassorb 81). Preferred UV stabilizers are mixtures of low and / or high molecular weight UV stabilizers, such as n-hexadecyl-3,5-di-t-butyl-4-hydroxybenzoate, 2,2,6,6-tetramethyl-4-piperidinol and higher fatty acids (mainly stearic acid) and / or poly((6-morpholino-s-triazine-2,4-diyl)(1,2,2,6,6-pentamethyl-4-piperidyl)imino)hexamethylene(1,2,2,6,6-pentamethyl-4-piperidyl)imino)).

[0114] α-nucleating agents such as sodium benzoate (CAS No. 532-32-1); 1,3:2,4-bis(3,4-dimethylbenzylidene)sorbitol (CAS No. 135861-56-2, Millad 3988). Suitable antistatic agents are, for example, glycerol esters (CAS No. 97593-29-8) or ethoxylated amines (CAS Nos. 71786-60-2 or 61791-31-9) or ethoxylated amides (CAS No. 204-393-1). These additives are typically added in amounts of 100 to 2,000 ppm per individual component of the polymer.

[0115] It will be appreciated that the present invention also relates to a method for preparing a polyolefin composition as defined herein, the method comprising the steps of: - providing a required amount of a mixture of said at least a first polypropylene homopolymer, optionally said at least one second polypropylene homopolymer, optionally said at least one third polypropylene homopolymer, and optionally said at least one polypropylene heterophasic copolymer, said recycled material blend (A), glass fibres and said at least one coupling agent; - melting the mixture in an extruder; and - optionally pelletizing the resulting polyolefin composition. Includes.

[0116] For purposes of the present invention, mixing and melting can be accomplished using any suitable melting and mixing means known in the art.

[0117] However, the melting and mixing step is preferably carried out in a mixer and / or blender, a high-shear or low-shear mixer, a high-speed blender, or a twin-screw extruder. Most preferably, the melting and mixing step is carried out in a twin-screw extruder, such as a co-rotating twin-screw extruder. Such twin-screw extruders are well known in the art, and those skilled in the art will adapt the melting and mixing conditions (e.g., melt temperature, screw speed, etc.) according to the process equipment.

[0118] The polyolefin compositions of the present invention are useful in a wide range of applications, including structural products, appliances, automotive articles, pipes, films, geomembranes, roofing applications, pond liners, and the like. In addition, due to the sufficient tensile properties of the compositions according to the invention, they can be used in the manufacture of flexible polymers such as film (having a thickness of 400 microns or less) or in the manufacture of flexible polymers such as geomembranes for agriculture, roofing, etc. They can be used for concrete structures (having a thickness of more than 400 microns) and as pond liners. Typically, the compositions described herein are used as the core layer of a multi-layer sheet (e.g., a three-layer geomembrane sheet) where the outer layers are made from various types of polyolefin materials. [Example]

[0119] Experimental Section The following examples are included to demonstrate certain aspects and embodiments of the claimed invention. However, those of ordinary skill in the art will understand that the following descriptions are merely illustrative and should not be construed as limiting the invention in any way.

[0120] Test Method The following definitions of terms and determination methods apply to the above general description of the invention as well as to the following examples, unless otherwise defined.

[0121] a) Determination of the contents of isotactic polypropylene (iPP), polystyrene (PS), ethylene, PVC and polyamide-6 in recycled blends

[0122] Sample preparation All calibration and analyte samples were prepared in a similar manner on melt-pressed plates. Approximately 2–3 g of the analyte compound was melted at 190 °C. Subsequently, 60–80 bar pressure was applied for 20 seconds in a hydraulic heating press. Next, to control the compound morphology, the sample was cooled to room temperature in 40 seconds in a cold press under the same pressure. Plate thickness was controlled by a 2.5 cm x 2.5 cm metal calibrated frame plate with a thickness of 100–200 μm (depending on the sample's MFR). Two plates were fabricated in parallel at the same time under the same conditions. The thickness of each plate was measured before any FTIR measurement, and all plates were 100–200 μm thick. To control the plate surface and avoid any interference during measurement, all plates were pressed between two double-sided silicone release papers. For powder samples or heterogeneous compounds, this pressing process was repeated three times to increase homogeneity by pressing and cutting the sample under the same conditions as above.

[0123] Spectrometer: A standard transmission FTIR spectrometer, such as a Bruker Vertex 70 FTIR spectrometer, was used with the following settings: Spectral range: 4000~400cm -1 ; Aperture: 6mm; Spectral resolution: 2cm -1 ; · Background scan: 16, Spectral scan: 16; ·Interferogram zero filling factor: 32; · Norton-Beer strong apodisation.

[0124] Spectra were recorded and analyzed using Bruker Opus software.

[0125] Calibration sample: Since FTIR is a secondary method, several calibration standards were compounded to cover the analytical range of interest, typically: · 0.2 wt% to 2.5 wt% for PA; · For PS, 0.1 wt% to 5 wt%; · For PET, 0.2% to 2.5% by weight; For PVC, 0.1% to 4% by weight.

[0126] The following commercially available materials were used in the compounds: Borealis HC600TF (as iPP), Borealis FB3450 (as HDPE), and target polymers (RAMAPET N1S (Indorama Polymer) for PET, Ultramid® B36LN (BASF) (for Polyamide 6), Styrolution PS 486N (Ineos) (for high-impact polystyrene (HIPS)), and PVC Inovyn PVC263B (in powder form).

[0127] All compounds were prepared on a small scale in a Haake kneader at temperatures below 265°C and for less than 10 minutes to avoid decomposition. Additional antioxidants, such as Irgafos 168 (3000 ppm), were added to minimize decomposition.

[0128] Calibration: The FTIR calibration principle was the same for all components: the intensity of a particular FTIR band divided by the plate thickness was calculated for the same plate. 1 H or 13C correlated with the amounts of the components determined by solution-state NMR.

[0129] Each specific FTIR absorption band was chosen because it increases in intensity with the amount of component concentration and is separated from the remaining peaks, regardless of the composition of the calibration standards and the actual sample.

[0130] This methodology is described in the publication by Signoret et al.: "Changes in plastic spectra in the MIR and potential impacts on identification for recycling", Resources, conservation and Recycling journal, 2020, volume 161, article 104980.

[0131] The wavelengths for each calibration band are: For PA, 3300cm -1 ; For PS, 1601cm -1 ; For PET, 1410cm -1 ; For PVC, 615cm -1 ; For iPP, 1167cm -1 is.

[0132] For each polymer component i, a linear calibration (based on the linearity of the Beer-Lambert law) was constructed. A typical linear correlation used for such a calibration is shown below:

[0133]

number

[0134] where x i is the fraction (wt%) of polymer component i. E i is the absorbance of the specific bands associated with polymer component i (i.e., in absorbance units). These specific bands are -1, 1601cm for PS -1 , 1410 cm for PET -1 , 615cm for PVC -1 , 1167 cm for iPP -1 is. d is the thickness of the sample plate. A i and B i are the two correlation coefficients determined for each calibration curve.

[0135] No specific isolated band was found for the C2-rich fraction, so the C2-rich fraction can be indirectly estimated:

[0136]

number

[0137] The EVA, chalk, and talc contents are estimated "semi-quantitatively." This therefore makes the C2 rich content "semi-quantitative."

[0138] For each calibration standard, the amount of each component, whenever possible, is 1 H or 13 C (except for PA). The NMR measurements were performed on the exact same FTIR plate used to construct the FTIR calibration curve.

[0139] Calibration standards were prepared by mixing iPP and HDPE to generate a calibration curve. The film thickness of the calibration standards was 300 μm. Quantitative IR spectra were obtained using a Bruker Vertex IR spectrometer to quantify the iPP, PS, and PA6 content in the samples. The spectra were recorded in the solid state using a 70 FTIR spectrometer. The spectra were recorded on square films, 25 x 25 mm, 50-100 μm thick, prepared by compression molding at 190 °C and 4-6 mPa. Standard transmission FTIR spectroscopy was performed using a 4000-400 cm wavelength range. -1spectral range, 6mm aperture, 2cm -1 The measurements were performed with a spectral resolution of 100 s, 16 background scans, 16 spectral scans, an interferogram zero filling factor of 32, and Norton-Beer strong apodization.

[0140] About iPP, 1167cm -1 The absorption of the bands at 1000 nm was measured, and the iPP content was quantified according to a calibration curve (absorbance / thickness (cm) vs. iPP content (wt%)).

[0141] 1601cm -1 (PS) and 3300 cm -1 The absorption of the bands in (PA6) was measured, and the PS and PA6 contents were quantified according to a calibration curve (absorption / thickness (cm) vs. PS and PA content (wt%)). The ethylene content was obtained by subtracting the iPP, PS, and PA6 contents from 100. The analysis was performed in duplicate.

[0142] b) The amount of talc and chalk was measured by thermogravimetric analysis (TGA); experiments were performed using a Perkin Elmer TGA 8000. Approximately 10-20 mg of material was placed in a platinum pan. The temperature was equilibrated at 50°C for 10 minutes and then increased to 950°C at a heating rate of 20°C / min under nitrogen. The weight loss (WCO2) between approximately 550°C and 700°C was attributed to CO2 evolved from CaCO3, and the chalk content was therefore estimated as follows: Chalk content = 100 / 44 x WCO2

[0143] The temperature was then reduced to 300°C at a cooling rate of 20°C / min. The gas was then switched to oxygen and the temperature was increased again to 900°C. The weight loss during this process was assigned to carbon black (Wcb). Knowing the carbon black and chalk contents, the ash content excluding chalk and carbon black was calculated as follows: Ash content = (ash content remaining) -56 / 44 x WCO2 - Wcb

[0144] Here, the ash content is the weight percent measured at 900°C in the first step under nitrogen. The ash content is assumed to be the same as the talc content of the investigated recycled material. do.

[0145] c) Amount of paper and wood Paper and wood were determined by conventional laboratory methods, including milling, flotation, microscopy, and thermogravimetric analysis (TGA) or flotation techniques.

[0146] d) Metal content was determined by x-ray fluorescence (XRF).

[0147] e) The amount of limonene was determined by solid phase microextraction (HS-SPME-GC-MS). Further details regarding specific samples are provided below.

[0148] f) The amount of total fatty acids was determined by solid phase microextraction (HS-SPME-GC-MS). Further details regarding specific samples are provided below.

[0149] g) Melt flow rate was measured as indicated at 230°C or 190°C under a load of 2.16 kg (MFR2). Melt flow rate is the amount of polymer (g) extruded in 10 minutes at 230°C (or 190°C) under a load of 2.16 kg using a test apparatus conforming to ISO 1133.

[0150] h) Tensile modulus, tensile strength, tensile strain at break, tensile strain at tensile strength, tensile stress at break Measurements were taken after a 96 hour conditioning period of the specimens (23°C, 50% relative humidity).

[0151] The tensile modulus was measured according to ISO 527-2 (crosshead speed = 1 mm / min, 23°C) using injection-molded test specimens (dogbone shape, 4 mm thick) as described in EN ISO 1873-2.

[0152] Tensile strength and tensile strain at break were measured according to ISO 527-2 (crosshead speed = 50 mm / min, 23 °C) using injection-molded test specimens (dogbone shape, 4 mm thick) as described in EN ISO 1873-2.

[0153] The tensile strain in the tensile strength was measured using injection-molded test specimens (dogbone shape, 4 mm thick) as described in EN ISO 1873-2 at an elongation rate of 50 mm / min according to ISO 527-2 until the test specimen broke.

[0154] The tensile breaking stress was measured according to ISO 527-2 (crosshead speed = 50 mm / min) on samples prepared from compressed plaques with a sample thickness of 4 mm.

[0155] i) Impact strength was determined as Charpy impact strength according to ISO 179-1 / 1eA at +23°C (notched) or ISO 179-1 / 1eU at +23°C (unnotched) on injection-molded specimens of 80 x 10 x 4 mm prepared according to EN ISO 1873-2. According to this standard, the samples are tested after 96 hours.

[0156] Some examples (Comparative Examples - CE; Inventive Examples - IE) are summarized in Tables 1 to 4 below. It can be summarized that for the 20 and 30 wt% GF grades, the stiffness only decreases after the addition of 25 wt% REC material, and from then on is still at an acceptable level compared to the virgin standard.

[0157] Table 1 shows the results of one propylene homopolymer (PPH-1, MFR2: 8g / 10min, T c =112.3°C), a polyolefin composition containing a blend of recycled materials (A), glass fibers (GF1.2), a coupling agent and further additives.

[0158] Table 2 shows the results of the first polypropylene homopolymer (PPH-1, MFR2: 8 g / 10 min, T c = 112.3 °C), a second polypropylene homopolymer (PPH-6, MFR2: 0.2 g / 10 min, T c =118.9°C), the properties of a polyolefin composition containing a blend of recycled materials (A), glass fibers (GF1.2), a coupling agent and further additives are shown.

[0159] Table 3 shows the results of the first polypropylene homopolymer (PPH-2, MFR2: 20 g / 10 min, T c = 129.6 °C), a second polypropylene homopolymer (PPH-3, MFR2: 75 g / 10 min, T c = 116.9 °C), a third polypropylene homopolymer (PPH-6, MFR2: 0.2 g / 10 min, T c =118.9°C), the properties of a polyolefin composition containing a blend of recycled materials (A), glass fibers (GF1.2), a coupling agent and further additives are shown.

[0160] Table 4 shows the properties of polyolefin compositions containing various polypropylene homopolymers (PPH-1 with an MFR2 of 8 g / 10 min, PPH-2 with an MFR2 of 20 g / 10 min, PPH-3 with an MFR2 of 75 g / 10 min, PPH-4 with an MFR2 of 125 g / 10 min, PPH-5 with an MFR2 of 800 g / 10 min, PPH-6 with an MFR2 of 0.2 g / 10 min), heterophasic polypropylene copolymer (PPHeco-1 with an MFR2 of 18 g / 10 min), a blend of recycled materials (A), glass fibers (GF1.2), coupling agents and further additives.

[0161] Glass fibers can be obtained from one of the following sources: OC (Owens Corning), PPG / NEG, Johns Manville, 3B, Jushi, Taiwan Glass, Camelyaf, CPIC, Taishan; Glass fibers 1.2 (average length 4 mm, average diameter 13 μm) and 4.1 (average length 4.5 mm, average diameter 13 μm) may also be used.

[0162] The following additives were used: antioxidants: AO1 (Irganox 1010FF), AO2 (ARENOX DS), AO3 (IRGAFOS 168FF), AO4; pigment: CB (Plasblak PE6121, commercially available from Cabot); coupling agent: SCONA TPPP 8112 GA (AP1.5 adhesion promoter: polypropylene highly functionalized with maleic anhydride).

[0163] [Table 1]

[0164] Table 1: Properties of polyolefin compositions (Comparative Examples CE1-2) containing one propylene homopolymer (PPH-1 with an MFR2 of 8 g / 10 min) or a blend of recycled materials (A) (Dipolen), each mixed with glass fiber GF1.2, and polyolefin compositions according to the invention (Inventive Examples IE1-2) containing one propylene homopolymer (PPH-1 with an MFR2 of 8 g / 10 min), a blend of recycled materials (A) (Dipolen) and glass fiber GF1.2.

[0165] As can be seen from Table 1, the melt flow rate of the homopolymer-recycled composition according to Example IE of the present invention is higher than the melt flow rate of the virgin homopolymer (CE-1). The melt flow rate of the homopolymer-recycled composition according to the present invention is also high, but lower than that of the virgin homopolymer (CE-1), while the tensile modulus of the homopolymer-recycled composition according to the present invention is lower than that of the virgin homopolymer (CE-1), but higher than that of the recycled composition (CE-2).

[0166] Therefore, the properties of the homopolymer-recycle composition of the present invention are characterized by a melt flow rate that allows for good processing, and a tensile modulus that indicates a stable material.

[0167] Furthermore, the properties of the homopolymer-recycle compositions of the present invention fall in the range between virgin homopolymer and recycled, thus the homopolymer-recycle compositions of the present invention have similar properties to virgin homopolymer but contain a proportion of recycled, and therefore have a better CO2 footprint.

[0168] [Table 2]

[0169] Table 2: Properties of polyolefin compositions (Comparative Examples CE3-6) containing a first polypropylene homopolymer (PPH-1 having an MFR2 of 8 g / 10 min), or a second polypropylene homopolymer (PPH-6 having an MFR2 of 0.2 g / 10 min), or a blend of recycled materials (A), with or without glass fiber GF1.2, and polyolefin compositions according to the present invention (Inventive Examples IE2-7) containing a first polypropylene homopolymer (PPH-1 having an MFR2 of 8 g / 10 min), a second polypropylene homopolymer (PPH-6 having an MFR2 of 0.2 g / 10 min), a blend of recycled materials (A), and glass fiber GF1.2.

[0170] Table 2 shows (similar to the results in Table 1) that the melt flow rates of the homopolymer-recycled compositions of Examples IE2-7 of the present invention are higher than that of the virgin homopolymer (CE-3) but lower than that of the recycled composition (CE-4). Meanwhile, the tensile modulus of the homopolymer-recycled compositions of Examples IE2-4 of the present invention is lower than that of the virgin homopolymer (CE-3) but higher than that of the recycled composition (CE-4). This result also demonstrates the effect of the amount of glass fiber: the more glass fiber added, the higher the tensile modulus (see IE2-4 and IE5-7).

[0171] [Table 3]

[0172] Table 3: Properties of polyolefin compositions (Comparative Examples CE7-10) containing polypropylene homopolymers (PPH-1 with an MFR2 of 8 g / 10 min, PPH-2 with an MFR2 of 20 g / 10 min, PPH-3 with an MFR2 of 75 g / 10 min, PPH-6 with an MFR2 of 0.2 g / 10 min), or a blend of recycled materials (A) (Dipolen), with or without glass fiber GF1.2, and polyolefin compositions according to the present invention (Inventive Examples IE8-11) containing a first polypropylene homopolymer (PPH-1 with an MFR2 of 8 g / 10 min), a second polypropylene homopolymer (PPH-2 with an MFR2 of 20 g / 10 min), a third polypropylene homopolymer (PPH-3 with an MFR2 of 75 g / 10 min), a fourth polypropylene homopolymer (PPH-6 with an MFR2 of 0.2 g / 10 min), a blend of recycled materials (A) (Dipolen), and glass fiber GF1.2.

[0173] Table 3 shows (similar to the previous results) that the melt flow rates of the homopolymer-recycle compositions according to the inventive examples IE8-11 are higher than that of the virgin homopolymer (CE-1). The tensile modulus of the homopolymer-recycle compositions according to the inventive examples again shows the effect of the amount of glass fiber, with the addition of more glass fiber resulting in a higher tensile modulus (see IE8-11).

[0174] [Table 4]

[0175] Table 4: Polyolefin compositions (Comparative Examples CE11-12) containing two polypropylene polymers (PPH-1 with an MFR2 of 8 g / 10 min, PPH-3 with an MFR2 of 75 g / 10 min, PPH-6 with an MFR2 of 0.2 g / 10 min, and PPHHeco-1 with an MFR2 of 18 g / 10 min) and glass fiber GF1.2, but not including the recycled material blend (A) (Dipolen), and various polypropylene homopolymers (PPH-1 with an MFR2 of 8 g / 10 min, PPH-2 with an MFR2 of 20 g / 10 min, PPH-3 with an MFR2 of 75 g / 10 min, PPH-4 with an MFR2 of 125 g / 10 min, PPH-5 with an MFR2 of 800 g / 10 min, and PPH-6 with an MFR2 of 0.2 g / 10 min). 2), and / or heterophasic polypropylene copolymer (PPHeco-1 with MFR2 of 18 g / 10 min), a blend of recycled materials (A) (Dipolen) and glass fiber GF1.2 (inventive examples IE12-15).

[0176] The results in Table 4 show that the melt flow rate and tensile modulus of the homopolymer-recycle compositions according to Examples IE12 to IE15 of the present invention can be adjusted by the type of virgin polymer added to the composition.

Claims

1. a) 30 to 60 wt. % (based on the total weight of the polymer composition) of at least one polypropylene homopolymer; b) a blend (A) of recycled plastic materials containing 15 to 40% by weight (based on the total weight of the polymer composition) of polypropylene and polyethylene, having a melt flow rate MFR in the range of 8 to 14 g / 10 min; ２ a blend (A) of recycled plastic materials recovered from waste plastic materials originating from post-consumer waste and / or industrial waste, having a polypropylene content of 50 to 99% by weight based on the total weight of the blend (A) of recycled plastic materials; c) 17 to 50 wt. % (based on the total weight of the polymer composition) of glass fibers; d) 0.5 to 2.5 wt. % (based on the total weight of the polymer composition) of at least one coupling agent; and optionally further additives. Including, A polyolefin composition, wherein the total of all components is always added to be 100% by weight, The polyolefin composition is characterized by: - Melt flow rate MFR of at least 2 g / 10 min ２ (230°C, 2.16 kg, measured according to ISO 1133); A tensile modulus of at least 4 GPa at -23°C (ISO 527-2), and - at least 5 kJ / m ２ Impact strength (ISO 179, Charpy 1eA +23°C).

2. a) 30 to 50 wt. % (based on the total weight of the polymer composition) of at least one polypropylene homopolymer; b) 15 to 40 wt. % (based on the total weight of the polymer composition) of a melt flow rate MFR in the range of 10 to 12 g / 10 min ２ a blend (A) of recycled plastic materials containing polypropylene and polyethylene having a modulus of elasticity (230°C, 2.16 kg, measured according to ISO 1133); c) 20 to 50 wt. % (based on the total weight of the polymer composition) of glass fibers; d) 0.5 to 2.5 wt. % (based on the total weight of the polymer composition) of at least one coupling agent; and optionally further additives. Including, 2. The polyolefin composition according to claim 1, wherein the total of all components is always added to be 100% by weight.

3. The polyolefin composition a1) at least one first polypropylene homopolymer; a2) at least one second polypropylene homopolymer; Including, wherein the at least one first polypropylene homopolymer and the at least one second polypropylene homopolymer have melt flow rates MFR ２ 3. The polyolefin composition according to claim 1, wherein the respective values ​​of the modulus of elasticity (230°C, 2.16 kg load, measured in accordance with ISO 1133) are different from each other.

4. The polyolefin composition a1) at least one first polypropylene homopolymer; a2) at least one second polypropylene homopolymer; a3) at least one third polypropylene homopolymer; Including, wherein the at least one first polypropylene homopolymer, the at least one second polypropylene homopolymer, and the at least one third polypropylene homopolymer have melt flow rates MFR ２ The polyolefin composition according to any one of claims 1 to 3, characterized in that the respective values ​​of (measured in accordance with ISO 1133 at 230°C and under a load of 2.16 kg) are different from each other.

5. The polypropylene homopolymer Melt flow rate MFR in the range of 5 to 15 g / 10 min ２ (230°C, 2.16 kg, measured according to ISO 1133); Melt flow rate MFR in the range of -10 to 30 g / 10 min ２ (230°C, 2.16 kg, measured according to ISO 1133); Melt flow rate MFR in the range of -60 to 100 g / 10 min ２ (230°C, 2.16 kg, measured according to ISO 1133); Melt flow rate MFR in the range of -100 to 150 g / 10 min ２ (230°C, 2.16 kg, measured according to ISO 1133); - Melt flow rate MFR in the range of 600 to 1000 g / 10 min ２ (230°C, 2.16 kg, measured according to ISO 1133); - Melt flow rate MFR of 1.5 g / 10 min or less ２ (230°C, 2.16 kg, measured according to ISO 1133); The polyolefin composition according to any one of claims 1 to 4, characterized in that it is selected from the group consisting of:

6. Polyolefin composition according to any one of claims 1 to 5, characterized in that it comprises at least one heterophasic polypropylene copolymer.

7. the heterophasic polypropylene copolymer Melt flow rate MFR in the range of -15 to 25 g / 10 min ２ 7. The polyolefin composition according to claim 6, characterized in that it is at least one heterophasic polypropylene copolymer (PPHeco-1) having a modulus of elasticity of 1000 kJ / cm2 at 230° C., 2.16 kg, measured according to ISO 1133.

8. Melt flow rate MFR in the range of 2 to 20 g / 10 min ２ The polyolefin composition according to any one of claims 1 to 7, characterized by a modulus of elasticity of the polyolefin composition (measured in accordance with ISO 1133, 2.16 kg, 230°C, ISO 1133).

9. 9. The polyolefin composition according to any one of claims 1 to 8, characterized by a tensile modulus (ISO 527-2) of at least 4.0 GPa.

10. Polyolefin composition according to any one of claims 1 to 9, characterized by an impact strength (ISO 179-1, Charpy 1eA +23°C) of at least 5.0 kJ / m 2 .

11. 11. The polyolefin composition according to any one of claims 1 to 10, characterized in that the glass fibers have a length of 2.0 to 10.0 mm and a diameter of 5 to 20 μm.

12. Polyolefin composition according to any one of claims 1 to 11, characterized in that said at least one coupling agent is a functionalized polypropylene.

13. Use of the polyolefin composition of any one of claims 1 to 12 in the manufacture of structural products, appliances, automotive articles, pipes, films, geomembranes, roofing applications, pond liners, packaging, caps and closures, and in the core layer(s) of multilayer polyolefin sheets or films.

14. An article comprising the polyolefin composition of any one of claims 1 to 12.

15. A process for preparing the polyolefin composition according to any one of claims 1 to 12, comprising: The polyolefin composition comprises: a1) at least one first polypropylene homopolymer; optionally, a2) at least one second polypropylene homopolymer; and optionally, a3) at least one third polypropylene homopolymer; and optionally at least one heterophasic polypropylene copolymer; Including, wherein said at least one first polypropylene homopolymer, said at least one second polypropylene homopolymer, and said at least one third polypropylene homopolymer have melt flow rates MFR2 (measured at 230°C, 2.16 kg load, in accordance with ISO 1133) different from one another; The method comprises: - providing a required amount of a mixture of said at least one first polypropylene homopolymer, optionally said at least one second polypropylene homopolymer, further optionally said at least one third polypropylene homopolymer, further optionally said at least one heterophasic polypropylene copolymer, said blend (A) of recycled plastic material, said glass fibres and said at least one coupling agent; - melting the mixture in an extruder; and - optionally pelletizing the resulting polyolefin composition 1. A method for preparing a polyolefin composition comprising:

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