Polyethylene composition for use with recycled polyethylene
AssigneeSabic Global Technologies B.V.
InventorsSarah Van Mierloo, Seda Cantekin, Thei Rauch
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Abstract
The present invention relates to a polyethylene composition comprising a polyethylene, preferably ≥95.0 wt % of polyethylene, and further (a) ≥100 and ≤500 ppm of a phenolic antioxidant; (b) ≥500 and ≤2500 ppm of an organic phosphite stabiliser; and (c) ≥500 and ≤2500 ppm of a metal stearate with regard to the total weight of the polyethylene composition. Such polyethylene composition, when used in a moulding process with PCR polyethylene, results in a reduction of the quantity of degradation products formed, which may be observed as a reduction of die deposits.
Claims12
A polyethylene composition comprising a polyethylene and further
- (a) ≥150 and ≤250 ppm of a phenolic antioxidant, wherein the phenolic antioxidant is 1,2-bis(3,5-di-tert-butyl-4-hydroxyhydrocinnamoyl)hydrazide;
- (b) ≥750 and ≤1500 ppm of an organic phosphite stabiliser, wherein the organic phosphite stabiliser is a triphosphite;
- and
- (c) ≥500 and ≤2500 ppm of a metal stearate
- with regard to the total weight of the polyethylene composition,
- wherein the polyethylene composition comprises a high-density polyethylene having a density of ≥945 and ≤970 kg/m3, wherein the density is determined in accordance with ASTM D792 (2008), and a melt-mass flow rate of:
- ≥0.1 and ≤2.0 g/10 min under a load of 2.16 kg;
- ≥1.0 and ≤10.0 g/10 min under a load of 5.0 kg;
- and/or
- ≥25.0 and ≤100.0 g/10 min under a load of 21.6 kg
- as determined in accordance with ASTM D1238 (2013) at a temperature of 190° C.
Dependencies are inferred from the claim text.