Patent ID: 6534451
Filing Date: 2003-03-18
Classification: C10M,C10N

Abstract:
A power transmission fluid composition which exhibits improved antiwear properties comprising a major amount of an oil of lubricating viscosity containing effective amounts of:(a) an ashless dispersant; (b) a friction modifier; (c) an antioxidant; (d) a viscosity modifier; and (e) an antiwear agent which is the product formed by reacting elemental sulfur and a dialkyl phosphite of the formula R1OR2OPOH, where R1 and R2 may be alkyl of 1 to 18 carbon atoms, at a temperature of 45-75Â° C., in the presence of an acylated amine compound selected from the group consisting of: wherein R1 and R2 in Structure A can be the same or different hydrocarbyl group from 4 to 200 carbon atoms, branched or linear and z is an integer from 1 to 8, and wherein R3 and R4 are the same or different alkyl groups of from 4 to 24 carbon atoms, branched or linear and z is an integer from 1 to 8, with the proviso that said antiwear agent provides to the composition 5 to 5,000 ppm sulfur and 5 to 5,000 ppm phosphorus.