Back to results
US 4,399,252 AGranted
Method of employing process oils from converted wastes in synthetic rubbers
AssigneePetrocon Corporation
InventorJohn J. Cunningham
Life of this patent
Estimating the term…
Loading patent…
Loading patent…
AssigneePetrocon Corporation
InventorJohn J. Cunningham
Estimating the term…
Process oil is made by conversion from "waste" materials, particularly used oils, and most particularly used crankcase oils, by flash evaporation at about 250.degree. F. and filtration for removal of solids therefrom, to produce a product substantially free of water and low boiling point components and of contaminant solids, which has a flash point above 310.degree. F., or is blended with other products from the same process to produce a final product having a flash point above 310.degree. F., and an aromatic content above 10%, preferably above 20%, by weight. The product may be used generally in a wide variety of process oil applications but is most particularly adapted for use as a rubber process oil and such use is also part of the present invention.
A meethod of using previously used oil comprising treating said oil to remove water, low boiling point compounds, and solid contaminants therefrom to convert said previously used oil to a process oil having an aromatic content of at least 10 percent by weight and a flash point above 310.degree. F., and incorporating said treated previously used oil as a process oil in a synthetic rubber composition.
Dependencies are inferred from the claim text.