Polyolefin Composition Comprising Polypropylene Homopolymer and Recycled Plastic Material

Abstract

Provided is a polyolefin composition including a) at least one polypropylene homopolymer; b) a blend of recycled plastic material including polypropylene and polyethylene in a ratio between 3:7 and 10:1, which is recovered from a waste plastic material derived from post-consumer and/or post-industrial waste; c) glass fibers; and d) at least one coupling agent. The polyolefin composition has a melt flow rate MFR.sub.2 (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 an impact strength (ISO179-1, Charpy 1eA +23° C.) of at least 6 kJ/m.sup.2.

Claims

1. A polyolefin composition comprising a) 30-60 wt % (based on the overall weight of the polymer composition) of at least one polypropylene homopolymer, b) 15-40 wt % (based on the overall weight of the polymer composition) of a blend of recycled plastic material comprising polypropylene and polyethylene in a ratio between 3:7 and 10:1, which is recovered from a waste plastic material derived from post-consumer and/or post-industrial waste having a melt flow rate MFR.sub.2 (230° C., 2.16 kg, measured according to ISO 1133) in the range of 8-14 g/10 min, c) 17-50 wt % (based on the overall weight of the polymer composition) of glass fibers; and d) 0.5-2.5 wt % (based on the overall weight of the polymer composition) of at least one coupling agent, and optionally further additives, wherein the sum of all ingredients add always up to 100 wt %, wherein the polyolefin composition has a melt flow rate MFR.sub.2 (230° C., 2.16 kg, measured according to ISO 1133) of at least 2 g/10 min; a tensile modulus at 23° C. of at least 4 GPa (ISO 527-2), and an impact strength (ISO179, charpy 1eA +23° C.) of at least 5 kJ/m.sup.2.

2. The polyolefin composition according to claim 1, wherein it comprises a) 30-50 wt % (based on the overall weight of the polymer composition) of the at least one polypropylene homopolymer, b) 15-40 wt % (based on the overall weight of the polymer composition) of the blend of recycled plastic material comprising polypropylene and polyethylene having a melt flow rate MFR.sub.2 (230° C., 2.16 kg, measured according to ISO 1133) in the range of 10-12 g/10 min, c) 20-50 wt % (based on the overall weight of the polymer composition) of glass fibers; and d) 0.5-2.5 wt % (based on the overall weight of the polymer composition) of the at least one coupling agent, and optionally further additives, wherein the sum of all ingredients add always up to 100 wt %.

3. The polyolefin composition according to claim 1, wherein it comprises a1) at least one first polypropylene homopolymer; and a2) at least one second polypropylene homopolymer; wherein the at least one first polypropylene homopolymer, and the at least one second polypropylene homopolymer differ from each other in their melt flow rate MFR.sub.2 (230° C., 2.16 kg load, measured according to ISO 1133).

4. The polyolefin composition according to claim 1, wherein it comprises a1) at least one first polypropylene homopolymer; a2) at least one second polypropylene homopolymer; and 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 differ from each other in their melt flow rate MFR.sub.2 (230° C., 2.16 kg load, measured according to ISO 1133).

5. The polyolefin composition according to claim 1, wherein the polypropylene homopolymers are selected from a group comprising at least one polypropylene homopolymer (PPH-1) having a melt flow rate MFR.sub.2 (230° C., 2.16 kg, measured according to ISO 1133) in the range of 5 to 15 g/10 min, preferably of 5 to 10 g/10 min, more preferably of 8 g/10 min; at least one polypropylene homopolymer (PPH-2) having a melt flow rate MFR.sub.2 (230° C., 2.16 kg, measured according to ISO 1133) in the range of range of 10 to 30 g/10 min, preferably of 15 to 25 g/10 min, more preferably of 20 g/10 min; at least one polypropylene homopolymer (PPH-3) having a melt flow rate MFR.sub.2 (230° C., 2.16 kg, measured according to ISO 1133) in the range of 60 to 100 g/10 min, preferably of 70 to 80 g/10 min, more preferably of 75 g/10 min; at least one polypropylene homopolymer (PPH-4) having a melt flow rate MFR.sub.2 (230° C., 2.16 kg, measured according to ISO 1133) in the range of 100 to 150 g/10 min, preferably of 100 to 130 g/10 min, preferably of 125 g/10 min; at least one polypropylene homopolymer (PPH-5) having a melt flow rate MFR.sub.2 (230° C., 2.16 kg, measured according to ISO 1133) in the range of 600 to 1000 g/10 min, preferably of 700 to 900 g/10 min, preferably of 800 g/10 min; at least one polypropylene homopolymer (PPH-6) having a melt flow rate MFR.sub.2 (230° C., 2.16 kg, measured according to ISO 1133) of ≤1.5 g/10 min, preferably in the range between 0.15 to 0.5 g/10 min, more preferably of 0.3 to 0.45 g/10 min, even more preferably of 0.2 g/10 min.

6. The polyolefin composition according to claim 1, wherein it comprises at least one heterophasic polypropylene copolymer.

7. The polyolefin composition according to claim 6, wherein the heterophasic polypropylene copolymer is at least one heterophasic polypropylene copolymer (PPHeco-1) having a melt flow rate MFR.sub.2 (230° C., 2.16 kg, measured according to ISO 1133) in the range of 15 to 25 g/10 min, preferably of 15 to 20 g/10 min, more preferably of 18 g/10 min.

8. The polyolefin composition according to claim 1, having a melt flow rate MFR.sub.2 (ISO 1133, 2.16 kg, 230° C., measured according to ISO 1133) in the range between 2 and 20 g/10 min, preferably between 3 and 17 g/10 min, more preferably between 5 and 15 g/10 min, even more preferably between 10 and 15 g/10 min.

9. The polyolefin composition according to claim 1, having a tensile modulus (ISO 527-2) of at least 4.0 GPa, preferably of at least 4.5 GPa; more preferably of at least 5.5 GPa, preferably of at least 6 GPa, more preferably at least 6.5 GPa, even more preferably at least 6.8 GPa, in particular in a range between 4 and 14 GPa, more in particular in a range between 4.5 and 12 GPa).

10. The polyolefin composition according to claim 1, having an impact strength (ISO179-1, Charpy 1eA +23° C.) of at least 5.0 kJ/m.sup.2, preferably of at least 6.0 kJ/m.sup.2, more preferably at least 7 kJ/m.sup.2, still more preferably of at least 7.5 kJ/m.sup.2, more preferably of at least 8 kJ/m.sup.2, even more preferably of at least 8.5 kJ/m.sup.2, in particular in a range between 5.0 and 12.0 kJ/m.sup.2, more in particular in a range between 5.5 and 10 kJ/m.sup.2.

11. The polyolefin composition according to claim 1, wherein the glass fibers have a length 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 and a diameter of from 5 to 20 μm, more preferably from 8 to 18 μm, still more preferably 8 to 15 μm.

12. The polyolefin composition according to claim 1, wherein the at least one coupling agent is a functionalized polypropylene, in particular a polypropylene functionalized with maleic anhydride (MAH).

13. (canceled)

14. An article comprising the polyolefin composition according to claim 1.

15. A process for preparing the polyolefin composition according to claim 1, comprising the steps of providing a mixture of the at least first polypropylene homopolymer; optionally the at least one second polypropylene homopolymer, further optionally the at least one third polyproyplene homopolymer, even further optionally the at least one polypropylene heterophasic copolymer; the blend of recycled material, glass fibers and the at least one coupling agent in the required amounts; melting the mixture in an extruder, and optionally pelletizing the obtained polyolefin composition.

Description

Experimental Section

[0243] The following Examples are included to demonstrate certain aspects and embodiments of the solution as described in the claims. It should be appreciated by those of skill in the art, however, that the following description is illustrative only and should not be taken in any way as a restriction of the solution.

Test Methods

[0244] The following definitions of terms and determination methods apply for the above general description of the solution as well as to the below examples unless otherwise defined.

a) Determination of the Content of Isotactic Polypropylene (iPP), Polystyrene (PS), Ethylene, PVC and Polyamide-6 in the Recyclate Blend

Sample Preparation

[0245] All calibration samples and samples to be analyzed were prepared in similar way, on molten pressed plates. Around 2 to 3 g of the compounds to be analyzed were molten at 190° C. Subsequently, for 20 seconds 60 to 80 bar pressure was applied in a hydraulic heating press. Next, the samples are cooled down to room temperature in 40 seconds in a cold press under the same pressure, in order to control the morphology of the compound. The thickness of the plates was controlled by metallic calibrated frame plates 2.5 cm by 2.5 cm, 100 to 200 μm thick (depending MFR from the sample); two plates were produced in parallel at the same moment and in the same conditions. The thickness of each plate was measured before any FTIR measurements; all plates were between 100 to 200 μm thick. To control the plate surface and to avoid any interference during the measurement, all plates were pressed between two double-sided silicone release papers. In case of powder samples or heterogeneous compounds, the pressing process was repeated three times to increase homogeneity by pressed and cutting the sample in the same conditions as described before.

Spectrometer

[0246] Standard transmission FTIR spectroscope such as Bruker Vertex 70 FTIR spectrometer was used with the following set-up: [0247] a spectral range of 4000-400 cm.sup.−1, [0248] an aperture of 6 mm, [0249] a spectral resolution of 2 cm.sup.−1, [0250] with 16 background scans, 16 spectrum scans, [0251] an interferogram zero filling factor of 32, [0252] Norton Beer strong apodisation.

[0253] Spectrum were recorded and analysed in Bruker Opus software.

Calibration Samples

[0254] As FTIR is a secondary method, several calibration standards were compounded to cover the targeted analysis range, typically from: [0255] 0.2 wt.-% to 2.5 wt.-% for PA [0256] 0.1 wt.-% to 5 wt.-% for PS [0257] 0.2 wt.-% to 2.5 wt.-% for PET [0258] 0.1 wt.-% to 4 wt.-% for PVC

[0259] The following commercial materials were used for the compounds: Borealis HC600TF as iPP, Borealis FB3450 as HDPE and for the targeted polymers such RAMAPET N1S (Indorama Polymer) for PET, Ultramid® B36LN (BASF) for Polyamide 6, Styrolution PS 486N (Ineos) for High Impact Polystyrene (HIPS), and for PVC Inovyn PVC 263B (under powder form).

[0260] All compounds were made at small scale in a Haake kneader at a temperature below 265° C. and less than 10 minutes to avoid degradation. Additional antioxidant such as Irgafos 168 (3000 ppm) was added to minimise the degradation.

Calibration

[0261] The FTIR calibration principal was the same for all the components: the intensity of a specific FTIR band divided by the plate thickness was correlated to the amount of component determined by .sup.1H or .sup.13C solution state NMR on the same plate.

[0262] Each specific FTIR absorption band was chosen due to its intensity increase with the amount of the component concentration and due to its isolation from the rest of the peaks, whatever the composition of the calibration standard and real samples.

[0263] This methodology was described in the publication from Signoret et al. “Alterations of plastic spectra in MIR and the potential impacts on identification towards recycling”, Resources, conservation and Recycling journal, 2020, volume 161, article 104980.

[0264] The wavelength for each calibration band was: [0265] 3300 cm.sup.−1 for PA, [0266] 1601 cm.sup.−1 for PS, [0267] 1410 cm.sup.−1 for PET, [0268] 615 cm.sup.−1 for PVC, [0269] 1167 cm.sup.−1 for iPP.

[0270] For each polymer component i, a linear calibration (based on linearity of Beer-Lambert law) was constructed. A typical linear correlation used for such calibrations is given below:

[00001]$\mathrm{xi}=A_i.\frac{E_i}{d}+B_i$

where x.sub.i is the fraction amount of the polymer component i (in wt %)

[0271] E.sub.i is the absorbance intensity of the specific band related to the polymer component i (in a.u. absorbance unit). These specific bands are, 3300 cm.sup.−1 for PA, 1601 cm.sup.−1 for PS, 1410 cm.sup.−1 for PET, 615 cm.sup.−1 for PVC, 1167 cm.sup.−1 for iPP

[0272] d is the thickness of the sample plate

[0273] A.sub.i and B.sub.i are two coefficients of correlation determined for each calibration curve

[0274] No specific isolated band can be found for C2 rich fraction and as a consequence the C2 rich fraction is estimated indirectly,

x.sub.C2 rich=100−(x.sub.iPP+x.sub.PA+x.sub.PS+x.sub.PET+x.sub.EVA+x.sub.PVC+x.sub.chalk+x.sub.talc)

[0275] The EVA, Chalk and Talc contents are estimated “semi-quantitatively”. Hence, this renders the C2 rich content “semi-quantitative”.

[0276] For each calibration standard, wherever available, the amount of each component is determined by either .sup.1H or .sup.13C solution state NMR, as primary method (except for PA). The NMR measurements were performed on the exact same FTIR plates used for the construction of the FTIR calibration curves.

[0277] Calibration standards were prepared by blending iPP and HDPE to create a calibration curve. The thickness of the films of the calibration standards were 300 μm. For the quantification of the iPP, PS and PA 6 content in the samples quantitative IR spectra were recorded in the solid-state using a Bruker Vertex 70 FTIR spectrometer. Spectra were recorded on 25×25 mm square films of 50 to 100 μm thickness prepared by compression moulding at 190° C. and 4 to 6 mPa. Standard transmission FTIR spectroscopy was employed using a spectral range of 4000 to 400 cm.sup.−1, an aperture of 6 mm, a spectral resolution of 2 cm.sup.−1, 16 background scans, 16 spectrum scans, an interferogram zero filling factor of 32 and Norton Beer strong apodisation.

[0278] The absorption of the band at 1167 cm.sup.−1 in iPP was measured and the iPP content was quantified according to a calibration curve (absorption/thickness in cm versus iPP content in wt.-%).

[0279] The absorption of the band at 1601 cm.sup.−1 (PS) and 3300 cm.sup.−1 (PA6) were measured and the PS- and PA6 content quantified according to the calibration curve (absorption/thickness in cm versus PS and PA content in wt.-%). The content of ethylene was obtained by subtracting the content of iPP, PS and PA6 from 100. The analysis was performed as double determination.

[0280] b) Amount of Talc and Chalk were measured by Thermogravimetric Analysis (TGA); experiments were performed with 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 afterwards raised to 950° C. under nitrogen at a heating rate of 20° C./min. The weight loss between ca. 550° C. and 700° C. (WCO.sub.2) was assigned to CO.sub.2 evolving from CaCO.sub.3, and therefore the chalk content was evaluated as:

Chalk content=100/44×WCO2

Afterwards the temperature was lowered to 300° C. at a cooling rate of 20° C./min. Then the gas was switched to oxygen, and the temperature was raised again to 900° C. The weight loss in this step was assigned to carbon black (Wcb). Knowing the content of carbon black and chalk, the ash content excluding chalk and carbon black was calculated as:

Ash content=(Ash residue)−56/44×WCO.sub.2−Wcb

[0281] Where Ash residue is the weight % measured at 900° C. in the first step conducted under nitrogen. The ash content is estimated to be the same as the talc content for the investigated recyclates.

[0282] c) Amount of Paper, Wood

[0283] Paper and wood were determined by conventional laboratory methods including milling, floatation, microscopy and Thermogravimetric Analysis (TGA) or floating techniques.

[0284] d) Amount of Metals was determined by x ray fluorescence (XRF).

[0285] e) Amount of Limonene was determined by solid phase microextraction (HS-SPME-GC-MS). Additional details are given below with respect to the specific sample.

[0286] f) Amount of total fatty acids

was determined by solid phase microextraction (HS-SPME-GC-MS).
Additional details are given below with respect to the specific sample.

[0287] g) Melt flow rates were measured with a load of 2.16 kg (MFR.sub.2) at 230° C. or 190° C. as indicated. The melt flow rate is that quantity of polymer in grams which the test apparatus standardized to ISO 1133 extrudes within 10 minutes at a temperature of 230° C. (or 190° C.) under a load of 2.16 kg.

[0288] h) Tensile Modulus, Tensile Strength, Tensile Strain at Break, Tensile Strain at Tensile Strength, Tensile Stress at Break

[0289] The measurements were conducted after 96 h conditioning time (at 23° C. at 50% relative humidity) of the test specimen.

[0290] Tensile Modulus was measured according to ISO 527-2 (cross head speed=1 mm/min; 23° C.) using injection moulded specimens as described in EN ISO 1873-2 (dog bone shape, 4 mm thickness).

[0291] Tensile strength and tensile Strain at Break was measured according to ISO 527-2 (cross head speed=50 mm/min; 23° C.) using injection moulded specimens as described in EN ISO 1873-2 (dog bone shape, 4 mm thickness).

[0292] Tensile Strain at Tensile Strength was determined according to ISO 527-2 with an elongation rate of 50 mm/min until the specimen broke using injection moulded specimens as described in EN ISO 1873-2 (dog bone shape, 4 mm thickness).

[0293] Tensile Stress at Break was determined according to ISO 527-2 (cross head speed=50 mm/min) on samples prepared from compression-moulded plaques having a sample thickness of 4 mm.

[0294] i) Impact strength was determined as Charpy Impact Strength according to ISO 179-1/1eA at +23° C. (Notched) or according to ISO 179-1/1eU +23° C. (Unnotched) on injection moulded specimens of 80×10×4 mm prepared according to EN ISO 1873-2. According to this standard samples are tested after 96 hours.

[0295] In the following Tables 1-4 several examples a (comparative-CE; inventive-IE) are summarized. For the 20 and the 30 wt % GF grades it can be summarized that the stiffness drops only after an addition of 25 wt % REC material and is still at an acceptable level thereafter compared to the virgin reference.

[0296] Table 1 refers to a polyolefin composition comprising one propylene homopolymer (PPH-1. MFR.sub.2 of 8 g/10 min, T.sub.c=112.3° C.), blend (A) of recycled material, Glass Fibers (GF1.2), coupling agent and further additives.

[0297] Table 2 refers to properties of a polyolefin composition comprising a first polypropylene homopolymer (PPH-1, MFR.sub.2 of 8 g/10 min, T.sub.c=112.3° C.), a second polypropylene homopolymer (PPH-6, MFR.sub.2 of 0.2 g/10 min, T.sub.c=118.9° C.), blend (A) of recycled material, Glass Fibers (GF 1.2), coupling agent and further additives.

[0298] Table 3 refers to properties of a polyolefin composition comprising a first polypropylene homopolymer (PPH-2, MFR.sub.2 of 20 g/10 min, T.sub.c=129.6° C.), a second polypropylene homopolymer (PPH-3, MFR.sub.2 of 75 g/10 min, T.sub.c=116.9° C.), a third polypropylene homopolymer (PPH-6, MFR.sub.2 of 0.2 g/10 min, T.sub.c=118.9° C.), blend (A) of recycled material, Glass Fibers (GF 1.2), coupling agent and further additives.

[0299] Table 4 refers to properties of a polyolefin composition comprising different polypropylene homopolymers (PPH-1 with MFR.sub.2 of 8 g/10 min, PPH-2 with MFR.sub.2 of 20 g/10 min , PPH-3 with MFR.sub.2 of 75 g/10 min, PPH-4 with MFR.sub.2 of 125 g/10 min PPH-5 with MFR.sub.2 of 800 g/10 min, PPH-6 with MFR.sub.2 of 0.2 g/10 min), a heterophasic polypropylene copoylmer (PPHeco-1 with MFR.sub.2 of 18 g/10 min), blend (A) of recycled material, Glass Fibers (GF 1.2), coupling agent and further additives.

[0300] Glass fibers may be obtained from one of the following suppliers: 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 be used.

[0301] The following additives were used: Antioxidants: AO1 (Irganox1010FF), AO2, (ARENOX DS), AO3 (IRGAFOS 168FF), AO4; Pigment: CB (Plasblak PE6121, commercerially available from Cabot); Coupling agent: SCONA TPPP 8112 GA (AP 1.5 Adhesion promoter: Polypropylene highly functionalized with maleic anhydride).

TABLE-US-00001 TABLE 1 Properties of polyolefin composition comprising one propylene homopolymer (PPH-1 with MFR.sub.2 of 8 g/10 min), or a blend (A) of recycled material (Dipolen) each mixed with Glass Fibers GF 1.2 (Comparitive Examples CE1-2) and polyolefin compositions comprising one propylene homopolymer (PPH-1 with MFR.sub.2 of 8 g/10 min), a blend (A) of recycled material (Dipolen) and with Glass Fibers GF 1.2 according to the solution (Inventive Examples IE1-2) unit CE1 IE1 CE2 Component PPH-1 wt % 67.55 33.4 0 DIPOLEN PP-70 wt % 0 32.9 66.3 GLASS 1.2 wt % 30.00 30 30 AP 1.5 wt % 1.00 1 1 CB wt % 0.70 0.70 0.70 AO1 wt % 0.25 0.25 0.25 AO2 wt % 0.40 0.40 0.40 AO3 wt % 0.10 0.10 0.10 100.00 100 100.00 Key properties MFR.sub.2 g/10 min 2.9 4.0 4.6 230° C./2, 16 kg Ash content wt % 30.4 30.8 Tensile MPa 7155 6620 6030 modulus 23° C. Tensile stress MPa 105.6 83.2 71.9 at yield 23° C. Tensile strain % 3.06 2.48 2.76 at yield 23° C. Tensile stress MPa 105 82 70.8 at break (@50 mm/min) 23° C. Tensile strain % 3.23 2.75 3.16 at break (@50 mm/min) 23° C. Charpy 1eA kJ/m.sup.2 11.55 8.22 8.54 +23° C. Charpy 1eU kJ/m.sup.2 54.31 37.4 36.90 +23° C.

[0302] As can be seen in Table 1 the melt flow rate of the homopolymer-recyclate composition according to the inventive example IE is higher than the one of the virgin homopolymer (CE-1) but lower than the one of the recyclate (CE-2). On the other hand, the tensile modulus of the homopolymer-recyclate composition according to the inventive example is lower than the one of the virgin homopolymer (CE-1) but higher than the one of the recyclate (CE-2).

[0303] Thus, the properties of the homopolymer-recyclate composition according to the solution are characterized by a melt flow rate allowing a good processing and by a tensile modulus indicating a stable material.

[0304] Furthermore, the properties of the homopolymer-recyclate composition according to the solution are in a range between the ones of a virgin homopolymer and a recyclate. Thus, the homopolymer-recyclate composition according to the solution has similar properties to virgin homopolymer, but comprising a percentage of recyclate and having therefore a better CO.sub.2 foot print.

TABLE-US-00002 TABLE 2 Properties of a polyolefin composition comprising a first polypropylene homopolymer (PPH-1 with MFR2 of 8 g/10 min ), a second polypropylene homopolymer (PPH-6 with MFR2 of 0.2 g/10 min) or a blend (A) of recycled material without or with Glass Fibers GF 1.2 (Comparitive Examples CE3-6) and polyolefin compositions comprising a first polypropylene homopolymer (PPH-1 with MFR2 of 8 g/10 min) or a second polypropylene homopolymer (PPH-6 with MFR2 of 0.2 g/10 min ), a blend (A) of recycled material and Glass Fibers GF 1.2 according to the solution (Inventive Examples IE2-7) Component unit CE3 CE4 CE5 CE6 IE2 IE3 IE4 IE5 IE6 IE7 PPH-1 wt % 67.55 81.9 50.6 42.5 33.7 46.5 38.9 31.1 PPH-6 wt % 16.0 16.0 16.0 16.0 16.0 Dipolen PP-70 wt % 67.5 61.9 16.9 25.0 33.8 15.4 26.0 30.8 GLASS 1.2 wt % 30 30 20 20 30 30 30 20 20 20 AP1.5 wt % 1.00 1.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0 CB wt % 0.70 0.7 0.7 0.7 0.7 0.7 0.7 0.7 0.7 0.7 AO1 wt % 0.25 0.3 0.3 0.3 0.3 0.3 0.3 0.3 0.3 0.3 AO2 wt % 0.40 0.40 0.40 0.40 0.40 AO3 wt % 0.10 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1 MFR.sub.2 230° C./2.16 kg g/10 min 2.9 6.8 1.61 3.02 3.9 4.2 4.6 2.1 2.2 2.3 Ash content wt % 30.4 31.1 20.33 21.08 30.5 30.6 30.9 20.55 20.96 20.76 Tensile modulus 23° C. MPa 7155 6151 5029 4348 6958 8848 6731 4877 4790 4711 Tensile stress at break MPa 105 73.4 81.98 59.46 90.1 86.4 84.3 71 68.1 66.81 (@50 mm/min) 23° C. Charpy 1eA +23° C. kJ/m.sup.2 11.6 9.0 10.3 8.1 8.8 8.3 8.5 7.8 7.9 7.6 Charpy 1eU +23° C. kJ/m.sup.2 54.3 38.2 48.8 37.5 43.1 42.2 40.4 38.7 36.9 37.0

[0305] Table 2 shows (similar to the results in Table 1) that the melt flow rate of the homopolymer-recyclate composition according to the inventive examples IE2-7 is higher than the one of the virgin homopolymer (CE-3) but lower than the one of the recyclate (CE-4). On the other hand, the tensile modulus of the homopolymer-recyclate composition according to the inventive examples IE2-4 is lower than the one of the virgin homopolymer (CE-3) but higher than the one of the recyclate (CE-4). The results also illustrate the impact of the amount of glass fibers, the more glass fibers added the higher is the tensile modules (see IE2-4 and IE5-7).

TABLE-US-00003 TABLE 3 Properties of a polyolefin composition comprising a polypropylenes homopolymers (PPH- 1 with MFR.sub.2 of 8 g/10 min, PPH-2 with MFR.sub.2 of 20 g/10 min, PPH-3 with MFR.sub.2 of 75 g/10 min, PPH-6 with MFR.sub.2 of 0.2 g/10 min ), or a blend (A) of recycled material (Dipolen) without or with Glass Fibers GF 1.2 (Comparitive Examples CE7-10) and polyolefin compositions comprising a first polypropylene homopolymer (PPH-1 with MFR.sub.2 of 8 g/10 min), a second polypropylene homopolymer (PPH-2 with MFR.sub.2 of 20 g/10 min ), a third polypropylene homopolymer (PPH-3 with MFR.sub.2 of 75 g/10 min ) or a fourth polypropylene homopolymer (PPH-6 with MFR.sub.2 of 0.2 g/10 min), a blend (A) of recycled material (Dipolen) and Glass Fibers GF 1.2 according to the solution (Inventive Examples IE8-11). Components unit CE7 CE8 CE9 CE10 IE8 IE9 IE10 IE11 IE16 PPH-1 wt % 67.55 61.65 61.55 PPH-2 wt % 11.75 11.75 13.35 13.35 56.2 PPH-3 wt % 22.9 25.9 27.9 33.6 PPH-6 wt % 16 16 4.9 4.9 5.6 5.5 Dipolen PP-70 wt % 67.55 28.0 25.0 30.7 25.0 20.00 GLASS 1.2 wt % 30 30 20 20 30 30 20 20 20.00 AP1.5 wt % 1.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0 1.00 CB wt % 0.7 0.7 0.7 0.7 0.7 0.7 0.7 0.7 0.7 AO1 wt % 0.25 0.25 0.25 0.25 0.25 0.25 0.25 0.25 AO2 wt % 0.4 0.4 0.1 0.4 0.4 0.1 0.1 0.4 AO3 wt % 0.1 0.1 0.4 0.4 0.1 0.1 0.4 0.4 0.1 AO4 wt % 0.25 MFR.sub.2 230° C./2.16 kg g/10 min 2.9 6.8 1.7 1.6 6.9 7.6 9.0 10.0 8.39 Ash content wt % 30.4 31.1 19.7 20.3 31.0 30.3 20.8 20.2 21.7 Tensile modulus 23° C. MPa 7155 6151 5054 5029 6958 7048 4947 5043 5256 Tensile strain at break % 3.23 2.95 3.63 3.63 2.50 2.48 2.85 2.77 (@50 mm/min) 23° C. Charpy 1eA +23° C. kJ/m.sup.2 11.6 9.0 9.3 10.3 7.7 7.8 6.1 6.3 6.0 Charpy 1eU +23° C. kJ/m.sup.2 54.3 38.2 48.1 48.6 37.9 38.0 33.0 33.5

[0306] Table 3 shows (similar to the previous results) that the melt flow rate of the homopolymer-recyclate composition according to the inventive examples IE 8-11 is higher than the one of the virgin homopolymer (CE-1). The tensile modulus of the homopolymer-recyclate composition according to the inventive examples again illustrate the impact of the amount of glass fibers, the more glass fibers added the higher is the tensile modules (see IE8-11).

TABLE-US-00004 TABLE 4 Properties of a polyolefin composition comprising two polypropylenes polymers (PPH-1 with MFR.sub.2 of 8 g/10 min, PPH-3 with 75 g/10 min, PPH-6 with MFR.sub.2 of 0.2 g/10 min, PPHeco-1 with MFR.sub.2 of 18 g/10 min) with Glass Fibers GF 1.2 but without a blend (A) of recycled material. (Dipolen) (Comparitive Examples CE11-12) and a polyolefin composition comprising different polypropylene homopolymers (PPH-1 with MFR.sub.2 of 8 g/10 min, PPH-2 with MFR.sub.2 of 20 g/10 min, PPH-3 with MFR.sub.2 of 75 g/10 min, PPH-4 with MFR.sub.2 of 125 g/10 min PPH-5 with MFR.sub.2 of 800 g/10 min, PPH-6 with MFR.sub.2 of 0.2 g/10 min ), and/or a heterophasic polypropylene copoylmer (PPHeco-1 with MFR.sub.2 of 18 g/10 min ), blend (A) of recycled material (Dipolen) and Glass Fibers GF 1.2 according to the solution (Inventive Examples IE12-15) Components unit IE12 IE13 IE14 IE15 CE11 CE22 PPH-1 wt % 62.55 PPH-2 wt % 12.55 27.55 15.55 PPH-3 wt % 49.55 PPH-4 wt % 15 22.55 22 PPH-5 wt % 10 PPHeco-1 wt % 10 15 28 PPH-6 wt % 15 Dipolen PP-70 wt % 40.00 40.00 40.00 40.00 GLASS 1.2 wt % 20.00 20.00 20.00 20.00 20.00 20.00 AP1.5 wt % 1.00 1.00 1.00 1.00 1.00 1.00 CB wt % 0.70 0.70 0.70 0.70 0.70 0.70 AO1 wt % 0.25 0.25 0.25 0.25 0.25 0.25 AO2 wt % 0.40 0.40 0.40 0.40 0.40 0.40 AO3 wt % 0.10 0.10 0.10 0.10 0.10 0.10 AO4 wt % SUM 100.0 100.0 100.0 100.0 100.0 100.0 Key properties unit Tm ° C. 163.90 164.30 163.20 164.20 165.80 163.20 Density g/cm.sup.3 1053.2 1058.4 1053.0 1058.8 1053.3 1027.9 MFR g/10 min 11.4 17.4 13.3 13.0 1.8 16.4 230° C./2.16 kg Ash content wt % 20.8 21.1 20.8 20.9 20.1 20.7 Flexural modulus MPa 3985 4227 3848 4173 4383 3922 23° C. Tensile modulus MPa 4599 4849 4454 4824 5092 4704 23° C. Tensile stress at MPa 61.78 67.66 59.18 67.21 81.48 75.54 break (@50 mm/min) 23° C. Charpy 1eA kJ/m.sup.2 7.2 6.2 7.6 6.3 9.5 11.0 +23° C.

[0307] The results in Table 4 show that melt flow rate and tensile modulus of the homopolymer-recyclate composition according to the inventive examples IE 12-15 can be adjusted by the type of virgin polymer added to the composition.