Automatic transmission and wet brake fluids and additive package

Details Automatic transmission and wet brake fluids and additive package Automatic transmission and wet brake fluids and additive package

1991-06-03

1998-10-06

Diamond, Alan

Solid anti-friction devices, materials therefor, lubricant or se

Lubricants or separants for moving solid surfaces and...

Organic compound containing boron

508185, 508188, 508189, 508192, 508194, 508227, 508228, 508346, 508355, 508583, 508421, 508419, 508420, C10M10514

Patent

active

058176055

ABSTRACT:
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 results in a desirable increase in the dynamic and/or static coefficients of friction of automatic 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.

REFERENCES:
patent: 2136846 (1938-11-01), Furlotti
patent: 2932615 (1960-04-01), Jordan et al.
patent: 3238130 (1966-03-01), Matson
patent: 3304258 (1967-02-01), White
patent: 3389088 (1968-06-01), Schar et al.
patent: 4331222 (1982-05-01), Liston et al.
patent: 4857214 (1989-08-01), Papay et al.

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