Polypropylene composition containing recycled polyolefin

Abstract

A recycled polyolefin composition comprising: A) 35% to 64% by weight of a recycled polypropylene B) 30% to 50% by weight of a propylene homopolymer C) 4% to 18% by weight of a propylene ethylene copolymer comprising: c1) 29% to 59% by weight of a propylene homopolymer; c2) from 41% to 71% by weight of a propylene ethylene copolymer wherein the melt flow rate of the recycled polyolefin composition, as determined according to ISO 1133 (230 DEG C, 2.16 kg), ranges from 34.0 g / 10 minutes to 64.0 g / 10 minutes.

Description

Technical Field

[0001] This disclosure relates to polypropylene compositions comprising recycled plastic materials that can be used to prepare extruded and molded articles. Background Technology

[0002] Due to the typically valuable properties of polyolefins, such as chemical inertness, mechanical properties, and non-toxicity, polyolefin compositions that possess elastic properties while maintaining good thermoplastic behavior have been used in many applications. Furthermore, they can be advantageously converted into finished products using the same techniques used for thermoplastic polymers. In particular, flexible polymer materials are widely used in the medical field, as well as in packaging, extrusion coating, and wire and cable covering.

[0003] Elastic polypropylene compositions exhibiting good thermoplastic behavior have been obtained in the art through sequential copolymerization of propylene, optionally containing a small amount of olefin comonomer, followed by a mixture of ethylene / propylene or ethylene / α-olefin copolymers. Catalysts based on titanium halide compounds supported on magnesium chloride are commonly used for this purpose. For example, EP-A-472 946 describes a flexible elastoplastic polyolefin composition comprising, by weight: A) 10 to 50 parts of isotactic propylene homopolymer or copolymer; B) 5 to 20 parts of an ethylene copolymer insoluble in xylene at room temperature; and C) 40 to 80 parts of an ethylene / propylene copolymer containing less than 40% ethylene by weight and soluble in xylene at room temperature; the intrinsic viscosity of said copolymer is preferably 1.7 dl / g to 3 dl / g. The composition is relatively flexible and has good elastic properties.

[0004] Furthermore, while polyolefin compositions are appreciated for their performance, they have raised concerns about sustainability, particularly given that their production is based on the use of non-renewable resources.

[0005] Therefore, a common attempt to mitigate this problem is to at least partially replace the virgin polyolefin composition with variable recycled plastic materials.

[0006] Recycled plastic polyolefins originate from post-consumer waste (PCW) or post-industrial waste (PIW) streams.

[0007] One of the key issues in polyolefin recycling is the difficulty in quantitatively separating different types of polymers, which means that commercially available recycled products are almost always contaminated with heterogeneous materials from various sources.

[0008] This fact leads to the conclusion that polymer compositions containing recycled materials are considered to suffer from lower reliability and lower performance compared to compositions made solely of virgin polymers.

[0009] It has now been unexpectedly discovered that adding recycled polymers to virgin polypropylene can result in improved property profiles, particularly in terms of impact properties. Summary of the Invention

[0010] Therefore, the object of this disclosure is a recycled polyolefin composition comprising:

[0011] A) 35% to 64% by weight; preferably 39% to 60% by weight, more preferably 42% to 58% by weight of a recycled polypropylene composition, the recycled polypropylene composition having:

[0012] i) Through 13 The C-NMR measurement ranges from 0.3 mol% to 1.8 mol%, preferably from 0.4 mol% to 1.7 mol%, and more preferably from 0.6 mol% to 1.8 mol% of the ethylene-derived unit content;

[0013] ii) through 13 The C-NMR measurement ranges from 0.4 mol% to 2.5 mol%, preferably from 0.5 mol% to 2.0 mol%, and more preferably from 0.7 mol% to 1.5 mol% of the 1-butene derivative unit content;

[0014] iii) Through 13 The content of propylene-derived units measured by C-NMR is higher than 90.0 mol%; preferably higher than 93.0 mol%; more preferably higher than 95.0 mol%.

[0015] iv) 13 The C-NMR sequence is BBB, where B is a 1-butene-derived unit ranging from 0.4 mol% to 2.5 mol%, preferably from 0.5 mol% to 2.0 mol%, and more preferably from 0.7 mol% to 1.5 mol%.

[0016] v) A melt flow rate in the range of 0.5 g / 10 min to 20.0 g / 10 min as determined by method ISO 1133 (230 °C, 2.16 kg); preferably 2.0 g / 10 min to 15.0 g / 10 min; more preferably 5.0 g / 10 min to 13.0 g / 10 min;

[0017] vi) A xylene-soluble fraction at 25°C ranging from 4.8 wt% to 10.7 wt%, preferably from 5.3 wt% to 9.8 wt%, and more preferably from 6.2 wt% to 9.2 wt%, as defined in ISO 16152:2005.

[0018] (B) 30% to 50% by weight, preferably 32% to 48% by weight, more preferably 35% to 45% by weight of a propylene homopolymer, the propylene homopolymer having: a melt flow rate in the range of 4.0 g / 10 min to 22.0 g / 10 min as determined by method ISO 1133 (230°C, 2.16 kg); preferably 7.0 g / 10 min to 20.0 g / 10 min; more preferably 9.0 g / 10 min to 16.0 g / 10 min; and a xylene-soluble fraction at 25°C in the range of 1.5% to 4.6% by weight as determined by ISO 16152:2005; preferably 2.2% to 4.3% by weight; more preferably 2.3% to 4.1% by weight.

[0019] C) 4% to 18% by weight; preferably 5% to 16% by weight; more preferably 6% to 14% by weight of a propylene-ethylene copolymer, the propylene-ethylene copolymer comprising:

[0020] c1) 29 wt% to 59 wt%; preferably 34 wt% to 54 wt%; more preferably 39 wt% to 49 wt% of a propylene homopolymer having: less than 4.0 wt% as determined according to ISO 16152:2005; preferably less than 3.5 wt%; more preferably less than 3.0 wt% of a xylene-soluble fraction; and a melt flow rate (ISO 1133, 230°C / 2.16 kg) in the range of 65 g / 10 min to 120 g / 10 min; preferably 70 g / 10 min to 115 g / 10 min; more preferably 75 g / 10 min to 110 g / 10 min.

[0021] c2) 41% to 71% by weight; preferably 46% to 66% by weight; more preferably 51% to 61% by weight of a propylene-ethylene copolymer, wherein the propylene-ethylene copolymer contains: as described in the specification 13 The ethylene-derived units, as measured by C-NMR, comprise 30.8% to 62.0% by weight; preferably 33.6% to 59.6% by weight; more preferably 38.7% to 57.9% by weight.

[0022] The propylene-ethylene copolymer further has the following characteristics:

[0023] - A melt flow rate ranging from 0.5 to 11.2 g / 10 min; preferably from 0.9 to 10.1 g / 10 min, more preferably from 1.5 to 8.5 g / 10 min (ISO 1133, 230°C / 5.0 kg);

[0024] - A fraction soluble in xylene at 25°C, ranging from 35.0% to 58.0% by weight, as defined in ISO 16152:2005; preferably from 38.0% to 56.0% by weight; more preferably from 40% to 53% by weight.

[0025] - The intrinsic viscosity of this fraction, which is soluble in xylene at 25°C, measured at 135°C in tetrahydronaphthalene, ranges from 2.3 dl / g to 4.9 dl / g; preferably from 2.6 dl / g to 4.5 dl / g; more preferably from 2.9 dl / g to 4.1 dl / g.

[0026] -As described in the instruction manual 13 The C-NMR method measures the total ethylene content in the range of 19.2 wt% to 35.9 wt%; preferably in the range of 22.4 wt% to 33.8 wt%; more preferably in the range of 23.6 wt% to 31.7 wt%.

[0027] In the propylene-ethylene copolymer, the sum of c1) and c2) refers to the total weight of c1) and c2) as 100% by weight.

[0028] The melt flow rate of the recycled polyolefin composition, as determined according to method ISO 1133 (230°C, 2.16 kg), ranges from 34.0 g / 10 min to 64.0 g / 10 min; preferably from 37.0 g / 10 min to 61.0 g / 10 min; more preferably from 41.0 g / 10 min to 57.0 g / 10 min.

[0029] The sum of the quantities of (A), (B), and (C) refers to the total weight of (A), (B), and (C), which is 100% of the total weight. Detailed Implementation

[0030] Component A of the recycled polypropylene composition is “post-industrial resin” (PIR). The term “PIR” refers to plastic materials derived from the mechanical recycling of post-industrial waste.

[0031] Preferably, component A of the recycled polypropylene composition does not contain limonene.

[0032] Preferably, recycled polypropylene composition component A) has at least one of the following characteristics:

[0033] i) 13 The C-NMR sequence XEX, wherein X can be a propylene-derived unit or a 1-butene-derived unit ranging from 0.20 mol% to 0.55 mol%, preferably ranging from 0.25 mol% to 0.50 mol%, and more preferably ranging from 0.32 mol% to 0.46 mol%.

[0034] ii) The range is 0.05 mol% to 0.40 mol%, preferably 0.10 mol% to 0.35 mol%, more preferably 0.15 mol% to 0.30 mol%. 13 C-NMR sequence EEE;

[0035] iii) 13 The C-NMR sequence XBX, where X can be a propylene-derived unit or a 1-butene-derived unit ranging from 0.50 mol% to 2.20 mol%, preferably from 0.68 mol% to 1.90 mol%, and more preferably from 0.75 mol% to 1.64 mol%.

[0036] iv) 13 The BBE sequence is absent in the C-NMR sequence.

[0037] Preferably, the propylene homopolymer component B) has a strength ranging from 2.0 to 9.0 kJ / m² as defined in ISO 179-1eA and ISO 1873-2. 2 More preferably, the range is 3.0 to 6.0 kJ / m 2， A more preferred range is 3.5 to 5.2 kJ / m 2 Charpy notch impact strength at 23°C.

[0038] The propylene homopolymer component B) has a tensile modulus between 980 MPa and 1980 MPa, preferably between 1180 MPa and 1780 MPa, and more preferably between 1280 MPa and 1680 MPa, as determined according to ISO 527.

[0039] The recycled polyolefin composition according to this disclosure preferably has a tensile modulus between 800 MPa and 1800 MPa, preferably between 850 MPa and 1500 MPa, and more preferably between 900 MPa and 1200 MPa, as determined according to ISO 527.

[0040] The recycled polyolefin composition preferably has a strength ranging from 3.0 to 8.0 kJ / m³ as defined by ISO 179-1eA and ISO 1873-2. 2 More preferably, the range is 3.8 to 6.0 kJ / m 2、 A more preferred range is 4.3 to 5.2 kJ / m 2 Charpy notched impact strength at 23℃. The Charpy notched impact strength at 0℃ ranges from 1.5 to 3.3 kJ / m. 2 Preferably, the value is between 2.0 and 3.0 kJ / m 2More preferably, it is between 2.1 and 2.8 kJ / m 2 between.

[0041] Preferably, the recycled polyolefin composition has at least one of the following characteristics:

[0042] - Melting point in the range of 150°C to 163°C; preferably in the range of 155°C to 161°C;

[0043] - Tc ranges from 108°C to 118°C; preferably from 111°C to 115°C.

[0044] The recycled polyolefin compositions according to this disclosure are particularly capable of achieving a balance between specific modulus and impact properties, particularly by maintaining a high modulus to improve impact properties, especially at 0°C.

[0045] The melt flow rate (MFR) of this recycled polyolefin composition can even be obtained through subsequent chemical treatment (chemical de-viscosity cracking).

[0046] Chemical de-tack cracking of polymers is carried out in the presence of free radical initiators such as peroxides.

[0047] The decomposition temperature of the peroxide most conveniently used in the polymer viscosity-reducing cracking process is preferably between 150°C and 250°C. Examples of the peroxide are di-tert-butyl peroxide, dicumyl peroxide, 2,5-dimethyl-2,5-di(tert-butylperoxy)hexyne, and 2,5-dimethyl-2,5-di(tert-butylperoxy)hexane, all of which are commercially available.

[0048] The amount of peroxide required for the viscosity-reducing cracking process is preferably from 0.001% to 0.5% of the polymer weight, more preferably from 0.001% to 0.2%.

[0049] As used herein, the term "polymer" refers to a polymer having two different repeating units in its chain. "Ambient temperature" and "room temperature" refer to a temperature of 25°C.

[0050] In this application, the term "crystalline polypropylene" refers to a propylene polymer with an isotactic five-unit group (mmmm) content greater than 70 mol% as measured by 13C-MNR for fractions insoluble in xylene at 25°C; and the term "elastomer" refers to a polymer with a solubility in xylene greater than 50 wt% at ambient temperature.

[0051] Component B can be obtained by polymerizing propylene using methods well known in the art. For example, component B can be commercially available, such as Moplen HP500N sold by Lyondellbasell.

[0052] Component C can be prepared by polymerizing propylene as a mixture with ethylene. Components B) and C) can be prepared in the presence of a catalyst containing the products of the reaction between the following substances:

[0053] i) A solid catalyst component comprising Ti, Mg, Cl and at least one internal electron donor compound;

[0054] ii) Alkyl aluminum compounds, and

[0055] iii) An external electron donor compound; preferably, the external electron donor compound has the following general formula:

[0056] (R7)a(R8)bSi(OR9)c,

[0057] Where a and b are integers from 0 to 2, c is an integer from 1 to 4 and the sum (a+b+c) is 4; R7, R8 and R9 are alkyl, cycloalkyl or aryl radicals having 1 to 18 carbon atoms, optionally containing heteroatoms.

[0058] The internal donor is preferably selected from esters of mono- or dicarboxylic acid organic acids, such as benzoates, malonates, phthalates, and certain succinates. Examples of internal donors are described in US 4522930A, EP 045977A2, and international patent applications WO 00 / 63261 and WO 01 / 57099. Phthalate esters and succinates are particularly suitable. Alkyl phthalates are preferred, such as diisobutyl phthalate, dioctyl phthalate, diphenyl phthalate, and benzyl butyl phthalate.

[0059] The particles of the solid component (i) may have a substantially spherical morphology and an average diameter between 5 μm and 150 μm, preferably between 20 μm and 100 μm, and more preferably between 30 μm and 90 μm. As particles having a substantially spherical morphology, those are meant to have a ratio between the larger axis and the smaller axis equal to or less than 1.5, and preferably less than 1.3.

[0060] The amount of Mg can preferably range from 8% to 30%, more preferably from 10% to 25% by weight.

[0061] The amount of Ti can range from 0.5% to 7%, and more preferably from 0.7% to 5% by weight.

[0062] According to one method, it can be achieved by making the expression Ti(OR) q-y X yA titanium compound (where q is the valence of titanium and y is a number between 1 and q), preferably TiCl4, is reacted with the following to prepare a solid catalyst component (i): magnesium chloride derived from an adduct of the formula MgCl2·pROH, where p is a number between 0.1 and 6, preferably 2 to 3.5, and R is a hydrocarbon group having 1 to 18 carbon atoms. The adduct can be suitably prepared in spherical form by mixing an alcohol and magnesium chloride under stirring at the melting temperature of the adduct (100°C to 130°C). The adduct is then mixed with an inert hydrocarbon that is immiscible with the adduct to produce an emulsion, which is rapidly quenched, causing the adduct to solidify in the form of spherical particles. Examples of spherical adducts prepared according to this procedure are described in USP 4,399,054 and USP 4,469,648. The adduct thus obtained can react directly with the Ti compound, or it can be pre-treated with thermally controlled dealcoholization (80°C to 130°C) to obtain an adduct in which the molar number of alcohol is less than 3, preferably between 0.1 and 2.5. The reaction with the Ti compound can be carried out by suspending the adduct (dealcoholized or similar) in cold TiCl4; the mixture is then heated to 80°C to 130°C and held at that temperature for 0.5 to 2 hours. The treatment with TiCl4 can be performed once or multiple times. Electron donor compounds can be added in the desired proportions during the TiCl4 treatment.

[0063] The alkyl-Al compound (ii) is preferably selected from trialkylaluminum compounds, such as, for example, triethylaluminum, triisobutylaluminum, tri-n-butylaluminum, tri-n-hexylaluminum, and tri-n-octylaluminum. Alalkylaluminum halides, alkylaluminum hydrides, or alkylaluminum sesquichlorides, such as AlEt2Cl and Al2Et3Cl3, may also be used (possibly in the form of mixtures with the above-mentioned trialkylaluminum compounds). The Al / Ti ratio is higher than 1 and is preferably in the range of 50 to 2000.

[0064] Particularly preferred is silicon compound (iii), wherein a is 1, b is 1, c is 2, and R is 1. 7 and R 8 At least one of them is selected from branched alkyl, cycloalkyl, or aryl groups having 3 to 10 carbon atoms, optionally containing heteroatoms, and R 9It is a C1-C10 alkyl group, especially methyl. Examples of such preferred silicon compounds are methylcyclohexyldimethoxysilane (C donor), diphenyldimethoxysilane, methyl-tert-butyldimethoxysilane, dicyclopentyldimethoxysilane (D donor), diisopropyldimethoxysilane, (2-ethylpiperidinyl)tert-butyldimethoxysilane, (2-ethylpiperidinyl)tert-hexyldimethoxysilane, (3,3,3-trifluoro-n-propyl)(2-ethylpiperidinyl)dimethoxysilane, and methyl(3,3,3-trifluoro-n-propyl)dimethoxysilane. Furthermore, it is also preferred that a is 0, c is 3, and R... 8 Optionally containing a branched alkyl or cycloalkyl group with heteroatoms, and R 9 These are methyl silicon compounds. Examples of such preferred silicon compounds are cyclohexyltrimethoxysilane, tert-butyltrimethoxysilane, and tert-hexyltrimethoxysilane.

[0065] The amount of external electron donor compound (iii) is such that the molar ratio between the organoaluminum compound and the external electron donor compound (iii) is 0.1 to 200, preferably 1 to 100, and more preferably 3 to 50.

[0066] Component C) can be prepared in a continuous sequence polymerization method, wherein component C1) is prepared in a first reactor, and component C2) is prepared in a second reactor in the presence of component C1) according to known techniques and in the gas phase, or in the liquid phase with or without an inert diluent, or by operating via a mixed liquid-gas technique.

[0067] Component C) is a heterogeneous propylene-ethylene copolymer, which may be commercially available, such as Hifax CA138A sold by Lyondellbasell.

[0068] The following embodiments are given for illustrative purposes and not for limiting the scope of this disclosure.

[0069] Example

[0070] Characterization methods

[0071] Melting temperature and crystallization temperature:

[0072] The melting point was determined by differential scanning calorimetry (DSC). The melting point of samples weighing between 5 mg and 7 mg was measured under cooling and heating conditions in an inert N2 flow using a DSC instrument according to ISO 11357-3 at a scan rate of 20 °C / min. The instrument was calibrated with indium.

[0073] Melt flow rate: determined according to method ISO 1133-1 (230°C, 2.16 kg).

[0074] Xylene-soluble fraction at 25°C (XS): The xylene-soluble fraction at 25°C has been determined according to ISO 16152:2005; wherein the solution volume is 250 ml, precipitation is carried out at 25°C for 20 minutes, of which 10 minutes are stirred with the solution (magnetic stirrer), and then dried at 70°C.

[0075] Intrinsic viscosity (IV): The sample was dissolved in tetrahydronaphthalene at 135 °C and then poured into a capillary viscometer. The viscometer tube (Ubbelohde type) was surrounded by a cylindrical glass jacket; this setup allowed for temperature control using a circulating thermostatic liquid. The downward movement of the meniscus was timed by a photoelectric device. The passage of the meniscus in front of the upper lamp activated a counter with a quartz crystal oscillator. When the meniscus passed through the lower lamp, it stopped the counter, and the outflow time was recorded: this was converted to an intrinsic viscosity value using the Huggins equation (Huggins, ML, *Journal of the American Chemical Society*, 1942, 64, 2716), provided that the flow time of the pure solvent was known under the same experimental conditions (same viscometer and same temperature). [η] was determined using a single polymer solution.

[0076] via 13 C-NMR determination of comonomers: 13 C-NMR spectra were acquired on a Bruker AV600 spectrometer equipped with a cryoprobe, which operated at 120 °C in Fourier transform mode at 150.91 MHz. S0.05 was obtained at 29.9 ppm. δδ Carbon peaks (nominated according to C.J. Carman, R.A. Harrington, and C.E. Wilkes, *Macromolecules*, 10, 3, 536 (1977)) were used as internal references. Approximately 30 mg of sample was dissolved in 0.5 mL of 1,1,2,2-tetrachloroethane-d2 at 120 °C. Each spectrum was acquired as a 90° pulse with a 15-second delay between pulses and removed using a CPD. 1 H- 13 C-coupling. 512 transient data points were stored in 65K data points using a 9000Hz spectral window. The triplet distribution was obtained using the following relationship:

[0077] XPX = 100I8 / Σ

[0078] XPE = 100I5 / Σ

[0079] EPE=100I4 / Σ

[0080] XBX=100I3 / Σ

[0081] XBE=100I2 / Σ

[0082] XEX=100I9 / Σ

[0083] XEE=100I1 / Σ

[0084] EEE=100(0.5I7+0.25I6) / Σ

[0085] Where Σ=I8+I5+I4+I3+I2+I9+I1+0.5I7+0.25I6

[0086] I is the area of ​​the corresponding carbon reported in Table 1.

[0087] And X can be propylene or 1-butene.

[0088] The molar amounts of ethylene, propylene, and 1-butene are obtained from the ternary set using the following relationship:

[0089] P(m%) = XPX + XPE + EPE

[0090] B(m%)=XBX+XBE+EBE

[0091] E(m%)=EEE+XEE+XEX

[0092] The molar content is converted to weight using the monomer molecular weight.

[0093] Table 1. Polymers containing ethylene / propylene / 1-butene 13 C-NMR spectral distribution

[0094] serial number Chemical shift (ppm) carbon sequence 1 37.64-37.35 <![CDATA[S αδ ]]> PEE 2 37.35–37.15 <![CDATA[T βδ ]]> XBE 3 35.27-34.92 <![CDATA[T ββ ]]> XBX 4 33.29-33.15 <![CDATA[T δδ ]]> EPE 5 30.93-30.77 <![CDATA[T βδ ]]> XPE 6 30.35–30.26 <![CDATA[S γδ ]]> PEEE 7 29.97–29.85 <![CDATA[S δδ ]]> EEE 8 29.14-28.31 <![CDATA[T ββ ]]> XPX 9 24.88–24.14 <![CDATA[S ββ ]]> XEX

[0095] Samples for mechanical testing have been obtained in accordance with ISO 1873-2:2007.

[0096] Charpy notch impact: determined according to ISO 179-1eA and ISO 1873-2

[0097] Yield elongation: Measured according to ISO 527.

[0098] Elongation at break: Measured according to ISO 527

[0099] Fracture stress: Measured according to ISO 527.

[0100] Tensile modulus according to ISO 527-2,

[0101] Component A)

[0102] Component A) is a PIR recycling resin with the characteristics reported in Table 1.

[0103] Table 1

[0104]

[0105]

[0106] Component B)

[0107] Component C is a commercial propylene homopolymer marketed by Lyondellbasell under the trade name Moplen HP500 N, with an MFR of 12.0 g / 10 min (2.16 kg at 230 °C); a fraction of 3.1 wt% soluble in xylene at 25 °C; and a concentration of 4 kJ / m³ at 23 °C. 2 Charpy notched impact strength and tensile modulus of 1400 MPa

[0108] Component C)

[0109] Component C) is a heterogeneous propylene copolymer marketed by LyondellBasell under the trade name Hifax CA138A. Its characteristics are reported in Table 2.

[0110] Table 2

[0111] Component C) c1) XS weight% 2.5 MFR 230℃ / 2.16kg g / 10 minutes 95 Separation weight% 44 c2) C2 content weight% 49.0 Separation weight% 56 Overall composition MFR 230℃ / 5kg g / 10 minutes 3 XS weight% 48.5 IV on XS dl / g 3.5 C2 content weight% 28.0

[0112] Comparative component C1) is a commercial HDPE sold by Lyondellbasell.

[0113] Example 1 and Comparative Example 2

[0114] Components A, B), C) and C1) have been blended in the amounts shown in Table 3.

[0115] Table 3

[0116] Example 1 Comparative Example 2 Component A 50 50 Component B 40 45 Component C 10 Component C1 5

[0117] To achieve the target MFR value, 710 ppm of the peroxide Enox 101 (2-5-dimethyl-2-5-di-tert-butylperoxy-hexane) was added to both formulations during extrusion.

[0118] The characteristics of the compositions of Example 1 and Comparative Example 2 are reported in Table 4.

[0119] Table 4

[0120] unit Example 1 Comparative Example 2 melt flow rate g / 10 minutes 49 43 Charpy 23°C <![CDATA[kJ / m 2 ]]> 4.9 3.1 Charpy 0°C <![CDATA[kJ / m 2 ]]> 2.3 1.4 D / B TT ℃ -8.7 >10 Tensile modulus <![CDATA[N / mm 2 ]]> 1120 1160 Hc J / g -91.9 -100.8 Hm J / g 83.2 90.2 Tm deg_C 158.4 158.4 Tc deg_C 112.9 110.8

[0121] The composition of Example 1 exhibits a higher Charpy ratio at substantially the same modulus.

Claims

1. A recycled polyolefin composition, said recycled polyolefin composition comprising: A) 35% to 64% by weight of a recycled polypropylene composition, said recycled polypropylene composition having: i) Through 13 C-NMR measurements were performed on ethylene-derived units ranging from 0.3 mol% to 1.8 mol%. ii) through 13 C-NMR measurements were performed on 1-butene-derived units ranging from 0.4 mol% to 2.5 mol%. iii) Through 13 The content of propylene-derived units was higher than 90.0 mol% as measured by C-NMR; iv) 13 The C-NMR sequence is BBB, where B is a 1-butene-derived unit ranging from 0.4 mol% to 2.5 mol%. v) Melt flow rate in the range of 0.5 g / 10 min to 20.0 g / 10 min as determined by method ISO 1133 (230 °C, 2.16 kg); vi) Xylene-soluble fraction at 25°C, ranging from 4.8 wt% to 10.7 wt% as defined in ISO 16152:2005; B) 30% to 50% by weight of a propylene homopolymer, said propylene homopolymer having: a melt flow rate in the range of 4.0 g / 10 min to 22.0 g / 10 min as determined by method ISO 1133 (230 °C, 2.16 kg); and a xylene-soluble fraction in the range of 1.5% to 4.6% by weight as determined by ISO 16152:2005 at 25 °C. C) 4% to 18% by weight of a propylene-ethylene copolymer, wherein the propylene-ethylene copolymer comprises: c1) 29% to 59% by weight of propylene homopolymer, said propylene homopolymer having: less than 4.0% by weight of xylene soluble fraction as determined according to ISO 16152:2005; and a melt flow rate in the range of 65 g / 10 min to 120 g / 10 min (ISO 1133, 230 °C / 2.16 kg); c2) 41% to 71% by weight of a propylene-ethylene copolymer, said propylene-ethylene copolymer containing: as described in the specification 13 Ethylene-derived units ranging from 30.8 wt% to 62.0 wt% as measured by C-NMR; The propylene-ethylene copolymer further has the following characteristics: - Melt flow rate ranging from 0.5 to 11.2 g / 10 min (ISO 1133, 230°C / 5.0 kg); - A fraction soluble in xylene at 25°C in amounts ranging from 35.0% to 58.0% by weight, as defined in ISO 16152:2005; - The intrinsic viscosity of the fraction that is soluble in xylene at 25°C, measured at 135°C in tetrahydronaphthalene, ranges from 2.3 dl / g to 4.9 dl / g; -As described in the instruction manual 13 C-NMR measurement is used for ethylene in the range of 19.2% to 35.9% by weight of total content; In the propylene-ethylene copolymer, the sum of c1) and c2) refers to the total weight of c1) and c2) as 100% by weight. The melt flow rate of the recycled polyolefin composition, as determined according to ISO 1133 (230°C, 2.16 kg), is in the range of 34.0 g / 10 min to 64.0 g / 10 min. The sum of the quantities of (A), (B), and (C) refers to the total weight of (A), (B), and (C), which is 100% of the total weight.

2. The recycled polyolefin composition according to claim 1, wherein: Component (A) ranges from 39% to 60% by weight. Component (B) ranges from 35% to 48% by weight; The range of component (C) is from 5% to 16% by weight.

3. The recycled polyolefin composition according to claim 1, wherein component A) has the characteristics of... 13 C-NMR measurements range from 0.4 mol% to 1.7 mol% of ethylene-derived units.

4. The recycled polyolefin composition according to claim 1, wherein component A) has the characteristics of... 13 C-NMR measurements were performed on 1-butene-derived units ranging from 0.5 mol% to 2.0 mol%.

5. The recycled polyolefin composition according to claim 1, wherein in component (C), c1) ranges from 34 wt% to 54 wt%; and c2) ranges from 46 wt% to 66 wt%.

6. The recycled polyolefin composition according to claim 1, wherein component (C) has a fraction ranging from 38.0% to 56.0% by weight that is soluble in xylene at 25°C.

7. The recycled polyolefin composition according to claim 1, wherein component (B) has a melt flow rate in the range of 7.0 g / 10 min to 20.0 g / 10 min as determined by the method ISO 1133 (230 °C, 2.16 kg).

8. The recycled polyolefin composition according to claim 1, wherein component (B) has a xylene-soluble fraction at 25°C in the range of 2.2% to 4.3% by weight as determined according to ISO 16152:2005.

9. The recycled polyolefin composition according to claim 1, wherein the intrinsic viscosity of the fraction in component C) that is soluble in xylene at 25°C, as measured in tetrahydronaphthalene, ranges from 2.6 dl / g to 4.5 dl / g.

10. The recycled polyolefin composition according to claim 1, wherein in component A), the... 13 The C-NMR sequence is BBB, where B is a 1-butene-derived unit ranging from 0.5 mol% to 2.0 mol%.

11. The recycled polyolefin composition according to claim 1, wherein in component A), the melt flow rate, as determined according to the method ISO 1133 (230°C, 2.16 kg), ranges from 2.0 g / 10 min to 15.0 g / 10 min.

12. The recycled polyolefin composition according to claim 1, wherein the intrinsic viscosity of the fraction in component C) that is soluble in xylene at 25°C, as measured in tetrahydronaphthalene at 135°C, ranges from 2.9 dl / g to 4.1 dl / g.

13. The recycled polyolefin composition according to claim 1, wherein in component C), the [material] as described in the specification 13 The total ethylene content measured by C-NMR ranged from 22.4% to 33.8% by weight.

14. The recycled polyolefin composition according to claim 1, wherein in component C), the fraction that is soluble in xylene at 25°C ranges from 40% to 53% by weight.

15. An injection-molded article prepared from the recycled polyolefin composition according to claim 1.

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