Control of the melt flow rate of polyolefin mixtures recovered from post-consumer durable goods
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United States of America Patent
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Jan 21, 2014
Grant Date -
Feb 21, 2013
app pub date -
Aug 15, 2012
filing date -
Aug 16, 2011
priority date (Note) -
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Abstract
A process for creating polyolefin blends from waste streams with controlled rheological properties can include processing a waste stream to make a mixture comprising a mixture comprising polypropylene and polyethylene and compounding the mixture with one or more peroxides or nitroxides to produce a polyolefin blend. For example, a process can include: determining the required melt flow rate of the end product; determining the ratio of polyethylene to polypropylene to achieve the required melt flow rate; effecting a separation of polypropylene from polyethylene to achieve the desired composition; determining the amount of peroxide or peroxide concentrate required to increase the melt flow rate to the required level; melt compounding the mixture; evaluating the melt flow rate of the product; and adjusting the composition of polyethyelene and polypropylene or the amount of peroxide added if necessary to achieve the required melt flow rate.
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