Process For Producing High Density Polyethylene Composition Having High Environmental Stress Crack Resistance From Post Consumer Plastic and Articles Made of Said Composition

摘要

A process may include providing a polyethylene post consumer resin, providing a virgin polyethylene resin, and blending the polyethylene post consumer resin with the virgin polyethylene resin to produce a composition. The polyethylene post consumer resin may have an ESCR of at most 10 hours, a density ranging from 0.950 to 0.967 g/cm3, and an HLMI of 40 to 70 g/10 min. The virgin polyethylene resin may include fractions A and B, with fraction A having a higher molecular weight and lower density than fraction B. Fraction A may have an HL275 of at least 0.1 g/10 min and of at most 4 g/10 min, and a density of at least 0.920 g/cm3 and of at most 0.942 g/cm. The virgin polyethylene resin may have an HLMI of 5 to 75 g/10 min, and a density ranging from 0.945 to 0.960 g/cm3.

主权项

1. A process to produce a polyethylene composition comprising post consumer resin (PCR) comprising the steps of:
providing a high density polyethylene post consumer resin (PCR) having an ESCR (100%) of at most 10 hours as determined according to ASTM D 1693 (2013) condition B, a density ranging from 0.950 to 0.967 g/cm3 as determined according to ASTM 1505 at a temperature of 23° C., an HLMI of 40 to 70 g/10 min as determined according to ISO 1133, condition G, at 190° C. and 21.6 kg; providing a virgin Ziegler-Natta catalyzed polyethylene resin, wherein the virgin Ziegler-Natta catalyzed polyethylene resin has a multimodal distribution and comprises at least two polyethylene fractions A and B, fraction A having a higher molecular weight and lower density than fraction B, wherein fraction A has a HL275 of at least 0.1 g/10 min and of at most 4 g/10 min as determined according to ISO 1133, condition G, at 190° C. and under a load of 21.6 kg wherein a die of 2.75 mm broad was used and has a density of at least 0.920 g/cm3 and of at most 0.942 g/cm3; and wherein the virgin Ziegler-Natta catalyzed polyethylene resin has an HLMI of 5 to 75 g/10 min as determined according to ISO 1133, condition G, at 190° C. and 21.6 kg, a density ranging from 0.945 to 0.960 g/cm3, the density being determined according to ASTM 1505 at a temperature of 23° C.; blending the high density polyethylene post consumer resin with the virgin Ziegler-Natta catalyzed polyethylene resin in to form a polyethylene composition, wherein said polyethylene composition comprises from 15 to 70 wt % of the high density polyethylene post consumer resin relative to the total weight of the polyethylene composition.