Ashless lubricating oil with high oxidation stability

Solid anti-friction devices – materials therefor – lubricant or se – Lubricants or separants for moving solid surfaces and... – Organic compound containing boron

Reexamination Certificate

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C208S018000, C208S019000

Reexamination Certificate

active

07547666

ABSTRACT:
An ashless hydraulic fluid or paper machine oil having a VI between 155 and 300, a RPVOT greater than 680 minutes, and a kinematic viscosity at 40° C. from 19.8 cSt to 748 cSt. An ashless hydraulic fluid or paper machine oil having a high VI and high RPVOT comprising: a) a Group III base oil with a sequential number of carbon atoms, and defined cycloparaffin composition or low traction coefficient, b) an ashless antioxidant additive concentrate, and c) low amount of VI improver. A process for making an ashless hydraulic fluid or paper machine oil comprising a) hydroisomerization dewaxing, b) fractionating, c) selecting a fraction having a very high VI, and a high level of molecules with cycloparaffinic functionality or a low traction coefficient, and d) blending the fraction with an ashless antioxidant. Also, a method of improving the oxidation stability of an ashless hydraulic fluid or paper machine oil.

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patent: 6251840 (2001-06-01), Ward et al.
patent: 7045055 (2006-05-01), Ziemer et al.
patent: 7195706 (2007-03-01), Abernathy et al.
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patent: 2006/0237344 (2006-10-01), Abernathy et al.
patent: 2006/0293193 (2006-12-01), Rosenbaum et al.
patent: 2007/0093396 (2007-04-01), Okazaki
patent: WO00/14183 (2000-03-01), None
U.S. Appl. No. 11/296,636, “Manual transmission fluid made with lubricating base oil having high monocycloparaffins and low multicycloparaffins,” Rosenbaum, filed Dec. 7, 2005, 31 pages.

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