Solid anti-friction devices – materials therefor – lubricant or se – Lubricants or separants for moving solid surfaces and... – Organic -co- compound
Patent
1998-10-15
2000-08-29
McAvoy, Ellen M.
Solid anti-friction devices, materials therefor, lubricant or se
Lubricants or separants for moving solid surfaces and...
Organic -co- compound
252 79, C10M14514
Patent
active
061108790
ABSTRACT:
The present invention provides for a lubricating composition including: a hydrocracker-derived, highly naphthenic, low viscosity index mineral oil; from about 2 wt. % to about 14 wt. % of at least one polymethacrylate polymer; and from about 2 wt. % to about 14 wt. % of a performance additive package. The hydrocracker-derived, highly naphthenic, low viscosity index mineral oil is prepared by: (1) passing a first bottoms portion including not more than about 67 wt. % of a fuels hydrocracker bottoms recycle stream to a dewaxing zone; and (2) passing a second bottoms portion including at least about 33 wt. % of the recycle stream back to the fuels hydrocracker for additional processing; and where the recycle stream has a viscosity at 100.degree. C. of less than about 4.0; (3) contacting the first bottoms portion with a dewaxing catalyst under catalytic dewaxing conditions, where at least a portion of the hydrocracker bottoms is substantially dewaxed; and (4) contacting at least a portion of the substantially dewaxed hydrocracker bottoms with a hydrofinishing catalyst under hydrofinishing conditions, thereby producing a hydrofinished, dewaxed hydrocracker bottoms; and removing from the hydrofinished, dewaxed hydrocracker bottoms at least one light fraction including diesel or jet fuel range material, thereby leaving a heavy fraction including the hydrocracker-derived, highly naphthenic, viscosity index mineral oil having a naphthenes content of at least about 33 wt. %. The lubricating composition has an unsheared kinematic viscosity at 100.degree. C. of at least about 7.3 centistokes; a sheared kinematic viscosity at 100.degree. C. of at least about 6.8 centistokes, where shear is measured by the 20-hour KRL method; and a Brookfield viscosity at -40.degree. C. of no greater than about 10,000 centipoise.
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Communication from European Patent Office dated Jan. 28, 2000.
Kramer David C.
Krug Russell R.
Lee Stephen K.
Lopez Jaime
Peterson Jay M.
Chevron U.S.A. Inc.
McAvoy Ellen M.
Schaal Ernest A.
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