Fluid composition for use in viscous coupling
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United States of America Patent
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Sep 25, 1990
Grant Date -
N/A
app pub date -
May 27, 1988
filing date -
May 30, 1987
priority date (Note) -
Expired
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Abstract
A fluid composition for use in a viscous coupling is provided, which comprises (A) a base oil made of a polyorganosiloxane fluid having a viscosity of from about 500 to about 500,000 centistokes at 25.degree. C., and (B) at least one component selected from the group consisting of sulfur and sulfur compounds (b) to (g) listed below being added in a minor amount to said base oil; (b) a hydrocarbon sulfide; (c) a sulfurized oil or fat which is the reaction product of an oil or fat and sulfur; (d) a zinc dithiophosphate; (e) a dialkyldithiocarbamic acid metal salt; (f) elemental sulfur; and (g) a cyclic hydrocarbon sulfide. This fluid composition can be stably used in a viscous coupling for an extended period.
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