Polyolefin composition comprising polypropylene polymers and recycled plastic materials
Provided is a polyolefin composition including a) at least one heterophasic polypropylene copolymer with a melt flow rate MFR 2 (230° C., 2.16 kg, measured according to ISO 1133) of at least 40 g/10 min, preferably of at least 60 g/10 min; b) at least one polypropylene homopolymer with a melt flow rate MFR 2 (230° C., 2.16 kg, measured according to ISO 1133) of at least 400 g/10 min; and c) a blend (A) of recycled plastic material comprising polypropylene and polyethylene in a ratio between 3:7 and 12:1, which is recovered from a waste plastic material derived from post-consumer and/or post-industrial waste with a melt flow rate MFR 2 (230° C., 2.16 kg, measured according to ISO 1133) of at least 5 g/10 min. The polyolefin composition has a melt flow rate MFR 2 (230° C., 2.16 kg, measured according to ISO 1133) of at least 20 g/10 min.
1 . A polyolefin composition comprising
a) 20-48 wt % of at least one heterophasic polypropylene copolymer with a melt flow rate MFR 2 (230° C., 2.16 kg, measured according to ISO 1133) of at least 40 g/10 min;
b) 2-30 wt % of at least one polypropylene homopolymer with a melt flow rate MFR 2 (230° C., 2.16 kg, measured according to ISO 1133) of at least 400 g/10 min; and
c) 40-60 wt %, of a blend (A) of recycled plastic material comprising polypropylene and polyethylene in a ratio between 3:7 and 12:1, which is recovered from a waste plastic material derived from post-consumer and/or post-industrial waste, with a melt flow rate MFR 2 (230° C., 2.16 kg, measured according to ISO 1133) of at least 5 g/10 min,
wherein the polyolefin composition has a melt flow rate MFR 2 (230° C., 2.16 kg, measured according to ISO 1133) of at least 20 g/10 min.
2 . The polyolefin composition according to claim 1 , wherein it comprises
a) 25-45 wt % of the at least one heterophasic polypropylene copolymer;
b) 5-27 wt % of the at least one polypropylene homopolymer; and
c) 50-55 wt % of the blend (A) of recycled plastic material comprising polypropylene and polyethylene
and optionally further additives, wherein the sum of all ingredients always adds up to 100 wt %.
3 . The polyolefin composition according to claim 1 , wherein it comprises
a) 20-40 wt % of the at least one heterophasic polypropylene copolymer;
b) 10-30 wt % of the at least one polypropylene homopolymer; and
c) 40-60 wt % of the blend (A) of recycled plastic material comprising polypropylene and polyethylene
and optionally further additives, wherein the sum of all ingredients always adds up to 100 wt %.
4 . The polyolefin composition according to claim 3 , wherein it has a melt flow rate MFR 2 (230° C., 2.16 kg, measured according to ISO 1133) of at least 50 g/10 min.
5 . The polyolefin composition according to claim 1 , wherein it comprises
a) 35-48 wt % of the at least one heterophasic polypropylene copolymer;
b) 2-10 wt % of the at least one polypropylene homopolymer; and
c) 40-60 wt % of the blend (A) of recycled plastic material comprising polypropylene and polyethylene
and optionally further additives, wherein the sum of all ingredients always adds up to 100 wt %.
6 . The polyolefin composition according to claim 5 , wherein it has a melt flow rate MFR 2 (230° C., 2.16 kg, measured according to ISO 1133) of at least 25 g/10 min.
7 . The polyolefin composition according to claim 1 , wherein it has a tensile modulus (ISO 527-2) of at least 1200 MPa.
8 . The polyolefin composition according to claim 1 , wherein it has an impact strength (ISO179, charpy 1 eA+23° C.) of at least 4 kJ/m 2 .
9 . The polyolefin composition according to claim 1 , wherein it has a puncture energy (ISO 6603-2, 4.4 m/s, 2 mm, 23° C.) of at least 1.5 J.
10 . The polyolefin composition according to claim 1 , wherein the at least one heterophasic polypropylene copolymer a) is selected from a group consisting of:
at least one heterophasic polypropylene copolymer (PPHeco-1) having a melt flow rate MFR 2 (230° C., 2.16 kg, measured according to ISO 1133) in the range of 80 to 120 g/10 min; and
at least one heterophasic polypropylene copolymer (PPHeco-2) having a melt flow rate MFR 2 (230° C., 2.16 kg, measured according to ISO 1133) in the range of 60 to 90 g/10 min, and mixtures thereof.
11 . The polyolefin composition according to claim 1 , wherein the at least one polypropylene homopolymer b) is selected from a group consisting of:
at least one polypropylene homopolymer (PPH-1) having a melt flow rate MFR 2 (230° C., 2.16 kg, measured according to ISO 1133) in the range of 600 to 1000 g/10 min;
at least one polypropylene homopolymer (PPH-2) having a melt flow rate MFR 2 (230° C., 2.16 kg, measured according to ISO 1133) in the range of 1000 to 1500 g/10 min;
at least one polypropylene homopolymer (PPH-3) having a melt flow rate MFR 2 (230° C., 2.16 kg, measured according to ISO 1133) in the range of 1700 to 2300 g/10 min;
at least one polypropylene homopolymer (PPH-4) having a melt flow rate MFR 2 (230° C., 2.16 kg, measured according to ISO 1133) in the range of 400 to 500 g/10 min and mixtures thereof.
12 . The polyolefin composition according to claim 1 , wherein blend (A) of recycled plastic material comprises a relative amount of units derived from propylene of greater than 50 wt % with respect to the total weight of blend (A).
13 . The polyolefin composition according to claim 1 , wherein blend (A) of recycled plastic material comprises a relative amount of units derived from ethylene of less than 47 wt % with respect to the total weight of blend (A).
14 . A process for producing the polyolefin composition according to claim 1 , wherein the process comprises the steps of
providing a mixture of the at least one polypropylene homopolymer b), the at least one heterophasic polypropylene copolymer a); and the blend (A) of recycled plastic material, in the required amounts;
melting the mixture in an extruder, and
optionally pelletizing the obtained polyolefin composition.
15 . An article comprising the polyolefin composition according to claim 1 .