Mineral oil infusion of polypropylene

Details Mineral oil infusion of polypropylene Mineral oil infusion of polypropylene

2008-04-10

2010-10-05

Sanders, Kriellion A (Department: 1796)

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Processes of preparing a desired or intentional composition...

C524S081000, C524S570000

Reexamination Certificate

active

07807731

ABSTRACT:
A biodegradable plastic used for disposable packaging and other product which will degrade when disposed of in a land fill. The biodegradation begins in about 10 years after disposal. The shelf life of the disposable products is about 90 to 120 days before the infused mineral oil will begin to weep out of the plastic. The shelf life will be decreased if the plastic is stored at above 50 degrees Centigrade. The biodegradable plastic is made from a mixture of about 11.5% by weight of medical grade mineral oil to polypropylene. A mixing device having a feed chamber with polypropylene and mineral oil added to the feed chamber at a rate coordinated with the movement of the mixing and infusion screw delivers infused mineral oil in the polypropylene at a desired mixture ratio to a mold.

REFERENCES:
patent: 5087650 (1992-02-01), Willett
patent: 5480939 (1996-01-01), Jackson et al.

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