Ester lubricants containing polyoxyalkylene phenothiazines
AssigneeThe Dow Chemical Company
InventorsDennis A. Williams, Robert Carswell
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Abstract
Synthetic ester lubricant blends are described which contain 1-90 weight percent of an N-substituted polyoxyalkylene phenothiazine. The polyoxyalkylene group can be derived from ethylene, propylene, butylene or styrene oxides. The blends have superior oxidative and thermal stability and at the same time have good viscosity characteristics and pour points over a wide range of temperatures.
Claims13
A lubricant composition comprising an organic ester based synthetic fluid and about 1 to about 90 weight percent of a phenothiazine having an N-substituted polyoxyalkylene group and having a weight average molecular weight range from about 300 to about 5000 wherein the polyoxyalkylene group is derived from an alkylene oxide selected from ethylene, propylene, butylene, styrene oxides or mixtures thereof with the proviso that less than about 85% by weight of said phenothiazine is derived from ethylene oxide when said polyoxyalkylene group is derived from ethylene oxide.
Dependencies are inferred from the claim text.