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US 10,597,600 B2Granted
Lubricating oil composition
AssigneeShell Oil Company
InventorsMitsuhiro Nagakari, Hiroshi Kaneko, Hiroyuki Tazaki
Life of this patent
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AssigneeShell Oil Company
InventorsMitsuhiro Nagakari, Hiroshi Kaneko, Hiroyuki Tazaki
Estimating the term…
A composition whereby a hydrocarbon-based base oil is used and in this base oil are incorporated, in terms of the total amount of the composition, 30 to 300 ppm of overbased calcium salicylate and, in net weight in terms of the total amount of the composition, 0.07 to 2.0 mass % of a non-dispersant polymethacrylate having a weight average molecular weight of 5000 to 200,000. The electrical conductivity at 25° C. of this composition is not less than 200 pS/m, the flash point is not less than 240° C., the pour point is −40° C. or lower and the micro clutch friction coefficient at 140° C. is not less than 0.08. This lubricating oil composition may be used in machines fitted with electronic control apparatus and can impart conductivity so as to inhibit the occurrence of “noise” which is detrimental to electronic control.
A lubricating oil composition comprising a hydrocarbon-based base oil and, in terms of the total amount of the composition, 30 to 300 ppm of overbased calcium salicylate as well as, in net weight in terms of the total amount of the composition, 0.07 to 2.0 mass % of a non-dispersant polymethacrylate the weight average molecular weight whereof is 5000 to 200,000, the electrical conductivity at 25° C. of said composition is not less than 200 pS/m, the flash point is not less than 240° C., the pour point is 40° C. or lower and the friction coefficient at 140° C. (in a micro clutch test) is not less than 0.08.
Dependencies are inferred from the claim text.