Fmc Corporation

Great Lakes Chemical Corporation

Sundeep G Shankwalkar

Douglas G Placek

Louis T Gunkel

John Crosby

Michael P Marino, Jr

The present invention is a composition particularly suitable for use as a base for aircraft non-flammable hydraulic fluids with reduced wear according to the ASTM four ball test. The compositions comprise trialkyoxyalkyl phosphate esters optionally formulated with alkyl phosphite esters and alkyl and alkaryl phosphate esters.

Aircraft hydraulic fluid basestocks

The antiwear properties of synthetic ester lubricants intended for use at high temperatures (150.degree. C. to 350.degree. C.) are improved by adding to the lubricants a hydrocarbon insoluble, synthetic ester soluble, aryl diphosphate ester composition containing a major amount of an aryl diphosphate ester of the formula: ##STR1## wherein Ar is unsubstituted or alkyl (C.sub.1 -C.sub.12) substituted arylene and R is unsubstituted or alkyl (C.sub.1 -C.sub.12) substituted aryl.

Synthetic ester lubricant having improved antiwear properties

The invention is a novel composition of alkylated phenyl phosphate esters comprising by weight 1% to 20% trialkylphenyl phosphate, 10% to 50% dialkylphenyl monophenyl phosphate, 15% to 60% monoalkylphenyl diphenyl phosphate and less than 2% triphenyl phosphate and a process for preparing the composition comprising passing the composition at least once through a thin film evaporator at a temperature of about 200.degree. C. to about 250.degree. C. at a pressure sufficiently less than 5 kPa to evaporate about 5% to about 30% of the composition.

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East Brunswick, NJ, United States of America

Sundeep G Shankwalkar