Exxon Research and Engineering Company

John E Williams

Jack Ryer

Edward Francis Outten

Chung Kun Shih

There is disclosed a process for the solubilization of a mercaptobenzothiazole amine salt with a solvent such as dihexyl phthalate which solubilized salt is in turn suitable for dissolution into a lubricating oil composition, such as an automatic transmission fluid, even at room temperature.

Process for the solubilization of mercaptobenzothiazole in a lubricating

A fluid having a mineral lubricating oil base and containing the combination of an oil-soluble tris (C.sub.8 -C.sub.24 hydrocarbyl) phosphite ester and an oil-soluble C.sub.8 -C.sub.24 hydrocarbyl substituted phenol, the weight ratio of said phosphite to said phenol ranging from about 4:1 to 1:4, preferably 3:1 to 1:3 whereby elastomer compatibility of said fluid is enhanced. The phosphite ester-substituted phenol combination imparts to the fluid the property of maintaining the chemical and physical properties of seals under oxidizing condition in automatic transmissions, power transmissions and power steering systems and thereby improves retention of the fluid in these mechanical structures; preferably when at least an inhibitory amount of an anti-oxidant capable of trapping free radicals at temperatures above 65.degree. C., preferably 80 .degree. to 200.degree. C. is present.

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Cranford, NJ, United States of America

John E Williams