Polyolefins compositions obtained from recycled polyolefins
A polypropylene composition made from or containing: (a) 65 to 85 weight % of a crystalline propylene polymer having an amount of isotactic pentads (mmmm), measured by 13C-MNR on the fraction insoluble in xylene at 25° C. higher than 97.0 molar % and a polydispersity index from 3 to 15; (b) 5 to 25 weight % of an elastomeric copolymer of ethylene and propylene, having an amount of recurring units deriving from ethylene ranging from 30 to 70 weight %, and being partially soluble in xylene at ambient temperature; wherein the fraction soluble in xylene at ambient temperature having an intrinsic viscosity value from 3 to 10 dl/g; and (c) 5 to 25 weight % of recycled polyethylene (r-PE) having a melt flow rate (190° C./2.16 Kg) from 0.1 to 10 g/10 min, wherein the polypropylene composition having a melt flow rate (ISO 1133 230° C./2.16 kg) higher than 3.0 to 15 g/10 min.
1 . A polypropylene composition comprising:
(a) 65 to 85 weight % of a crystalline propylene polymer having an amount of isotactic pentads (mmmm), measured by 13 C-MNR on the fraction insoluble in xylene at 25° C., higher than 97.0 molar % and a polydispersity index ranging from 3 to 15;
(b) 5 to 25 weight % of an elastomeric copolymer of ethylene and propylene, wherein the copolymer having an amount of recurring units deriving from ethylene ranging from 30 to 70 weight % and being partially soluble in xylene at ambient temperature; wherein the polymer fraction soluble in xylene at ambient temperature having an intrinsic viscosity value ranging from 3 to 10 dl/g; and
(c) 5 to 25 weight % of recycled polyethylene (r-PE) having a melt flow rate (190° C./2.16 Kg) from 0.1 to 10 g/10 min and containing an amount of polypropylene inclusions ranging from 1 to 15 weight % of the total r-PE component,
wherein the polypropylene composition has: a Charpy impact resistance at 23° C. from more than 10 to 15 kJ/m 2 , and has a value of melt flow rate (ISO 1133 230° C./2.16 kg) ranging from higher than 3.0 g/10 min. to 15 g/10 min.; the percentages of (a), (b) and (c) being referred to the sum of (a), (b) and (c).
2 . The polypropylene composition according to claim 1 , wherein
component (a) ranges from 70 to 83%, by weight;
component (b) ranges from 7 to 20% by weight; and
component (c) ranges from 7 to 20% by weight.
3 . The polypropylene composition according to claim 2 , wherein
component (a) ranges from 75 to 80%, by weight;
component (b) ranges from 8 to 15% by weight; and
component (c) ranges from 8 to 15% by weight.
4 . The polypropylene composition according to claim 1 , having a melt flow rate (ISO 1133 230° C./2.16 kg) ranging from 3.5 to 10 g/10 min.
5 . The polypropylene composition according to claim 1 , wherein component (c) has an amount of PP inclusions ranging from 5 to 10% wt based on the total weight of component (c).
6 . The polypropylene composition according to claim 1 , wherein component (c) has a density ranging from 0.940 to 0.965 g/cm 3 and a melt flow rate (190° C./2.16 Kg ISO 1133-1) from 0.1 to 1 g/10 min.
7 . The polypropylene composition according to claim 1 , wherein, in the component (a), the amount of isotactic pentads (mmmm), measured by 13 C-MNR on the fraction insoluble in xylene at 25° C. is higher than 97.5 molar %.
8 . The polypropylene composition according to claim 1 , wherein the component (a) has a polydispersity Index ranging from 3 to 10.
9 . The polypropylene composition according to claim 1 , wherein component (b) has amount of ethylene ranging from 40 to 60 wt. %.
10 . The polypropylene composition according to claim 1 , wherein, in component (b), the intrinsic viscosity of the xylene soluble fraction at 25° C. ranges from 3.5 to 8 dl/g.
11 . The polypropylene composition according to claim 1 , wherein, in component (b), the intrinsic viscosity of the xylene soluble fraction at 25° C. ranges from 4 to 6 dl/g.
12 . An injection-molded article comprising the polypropylene composition according to claim 1 .
13 . The injection-molded article of claim 12 , having the form of an automotive battery case.