Automatic transmission and wet brake fluids and additive...

C - Chemistry – Metallurgy – 10 – M

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C10M 129/06 (2006.01) C10M 129/08 (2006.01) C10M 141/02 (2006.01) C10M 159/12 (2006.01)

Patent

CA 2068624

Case EI-6335 AUTOMATIC TRANSMISSION AND WET BRAKE FLUIDS AND ADDITIVE PACKAGES THEREFOR Abstract Of the Disclosure Oil-based functional fluid compositions formulated for use as automatic transmission fluid, fluid for a wet brake system, or a friction-depending lubricant are improved by including in the composition a minor amount of at least one alcohol or polyol having less than 12 carbon atoms in the molecule. This resultsin a desirable increase in the dynamic and/or static coefficients of friction ofautomatic transmission or other frictional surfaces contacted by the composition. Preferred for this use is a composition formed by heating at least one ashless dispersant containing basic nitrogen and/or at least one hydroxyl group with a combination of at least (i) an inorganic acid of phosphorus, (ii) a boron compound, and (iii) a polyol having less than 12 carbon atoms, so that a liquid composition is formed. The boron compound and the inorganic phosphorus acid are preferably co-present during the heating. However either such substance can be added and subjected to the heating step after the other provided that the conditions used result in the formation of a clear, liquid composition.

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