Color temperature indicator for lubricating grease

Details Color temperature indicator for lubricating grease Color temperature indicator for lubricating grease

1993-05-24

1994-11-01

Niebling, John

Compositions

Electrolytes for electrical devices

252 515R, C10M14108

Patent

active

053605616

ABSTRACT:
Lubricating compositions containing a color temperature indicator are disclosed. The compositions irreversibly change their color when exposed to temperatures exceeding a predetermined limit temperature. The compositions include, as an essential component, from 0.2% to 4% weight of metal dithiocarbamates or dialkyldithiocarbamates, preferably of antimony and/or lead in combination with a dye, preferably a blue dye, in an amount of from 50 ppm to 2000 ppm. Other components, such as epoxy resins, may be also present, to increase and/or extend the range of temperatures in which the changes of color are observed. The compositions are useful as indicators of overheating of lubricated elements under severe operating conditions.

REFERENCES:
patent: 3164449 (1965-01-01), Buxbaum
patent: 3222279 (1965-12-01), Loeffler
patent: 3594125 (1971-07-01), Hamblin
patent: 3764273 (1973-10-01), Turner et al.
patent: 3883568 (1975-05-01), Turner et al.
patent: 3933657 (1976-01-01), Seni et al.
patent: 4764290 (1988-08-01), Currey
patent: 5154840 (1992-11-01), Drake et al.

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