Loomis S Chen

US Patent:

H15377, Jun 4, 1996

Filed:

Dec 1, 1994

Appl. No.:

8/348000

Inventors:

Kalathil C. Eapen - Beavercreek OH
Loomis S. Chen - Fairborn OH

Assignee:

The United States of America as represented by the Secretary of the Air
Force - Washington DC

International Classification:

C10M13528

US Classification:

252 54

Abstract:

A lubricant composition comprises a perfluorinated polyalkylether base fluid (PFPAE) and an oxidation-corrosion inhibiting amount of a perfluoro-substituted benzothiazole or bis-benzothiazole. The benzothiazole compound additive exhibits excellent solubility in the base fluid and possesses outstanding low volatility characteristics. As a result, the lubricant composition functions as a noncorrosive, stable material suitable for long term applications over a wide temperature range (-65. degree. F. to >600. degree. F. ) in an oxidative environment. The perfluoro-substituted benzothiazoles and bis-benzothiazoles have the formula: Q--R. sub. f or Q--R. sub. f '--Q, wherein Q is ##STR1## wherein R. sub. f is a linear or branched perfluoroalkylether group containing at least one ether linkage and R. sub. f ' is a linear or branched perfluoroalkyleneeher group containing at least one ether linkage.