Patent ID: 8633256

Claim:
A process for creating polyolefin blends from waste streams with controlled rheological properties, the process including: a) determining the required melt flow rate of the end product; b) determining the ratio of polyethylene to polypropylene to achieve the required melt flow rate, if the desired melt flow rate can be achieved with the unmodified blend or determining that the composition of the polyethylene component must be less than a certain amount if the required melt flow rate is greater than can be achieved with the unmodified blend; c) effecting a separation of polypropylene from polyethylene to achieve the desired composition; d) determining the amount of peroxide or peroxide concentrate required to increase the melt flow rate to the required level, if the required melt flow rate is greater than can be achieved with the unmodified blend; e) melt compounding the mixture of polyolefins plus any required peroxide in an extruder; f) evaluating the melt flow rate of the product; and g) adjusting the composition of polyethyelene and polypropylene or the amount of peroxide added if necessary to achieve the required melt flow rate.