Abstract: An uninhibited electrical insulating oil is prepared by blending a severely hydrotreated naphthenic distillate base oil having a viscosity of from about 50 to about 80 SSU at 38° C. and an aniline point from about 63° to about 84° C. with a solvent extracted, non-hydrogenated paraffinic distillate having at least 9.0 wt. % aromatic content.
Type:
Grant
Filed:
October 20, 2005
Date of Patent:
February 23, 2010
Assignee:
Ergon Refining, Inc.
Inventors:
John Kristopher Patrick, Lance A. Puckett, Jimmy M. Rasco, H. Don Davis