Synergistic combinations of hydrated potassium borate, antiwear

Compositions – Electrolytes for electrical devices

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72 42, 252 25, C10M 318, C10M 514, C10M 720, C10M 724

Patent

active

040897907

ABSTRACT:
A synergistic extreme-pressure lubricating composition comprising an oil of lubricating viscosity having dispersed therein: (1) 1-60 weight percent of hydrated potassium borate microparticles having a boron to potassium ratio of about 2.5 to 4.5 (2) from 0.01 to 5.0 weight percent of an antiwear agent selected from (a) a zinc dihydrocarbyl dithiophosphate having from 4 to 20 carbons in each hydrocarbyl group; (b) a C.sub.1 -C.sub.20 amine salt of a dihydrocarbyl dithiophosphoric acid having from 4 to 20 carbons in each hydrocarbyl group; (c) a zinc alkyl aryl sulfonate; or (d) mixtures thereof, and (3) from 0.1 to 5 weight percent of an oil-soluble antioxidant organic sulfur compound containing from 3 to 40 weight percent sulfur, which sulfur is present as organic sulfide or polysulfide or mixtures thereof.

REFERENCES:
patent: 3541014 (1970-11-01), Le Suer
patent: 3627681 (1971-12-01), Chander
patent: 3637499 (1972-01-01), Poliak
patent: 3853772 (1974-12-01), Adams
patent: 3856689 (1974-12-01), Hoke
patent: 3907691 (1975-09-01), King
patent: 3912639 (1975-10-01), Adams
patent: 3912644 (1975-10-01), Adams

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